Na plagioclase uses. It is an industrial mineral with many uses.

Na plagioclase uses Some models only use one Na atom and one Ca atom with partial occupancies and independent positions for the M site (Boysen & Kek, 2015). K. It would be folly to do this, however, without first examining the nature of all the binary Hydrogen and alkali ion diffusion in plagioclase feldspars is important to study the evolution of the crust and the kinetics of exsolution and ion-exchange reactions in feldspars. (interpreting mineral chemical formulas: atoms, molecules, elements) non-metallic. Beyond their geological importance, certain feldspar varieties are prized as gemstones. Plagioclases are fundamental constituents of the Earth’s crust and also Detailed description, properties, locality information guide about the plagioclase feldspar mineral group: albite to andesine. Plagioclase feldspars are easy to identify in thin section: they display first order grays and stripey twins. Plagioclase is a very common rock-forming tectosilicate, the second most abundant mineral in the Earth's crust, just behind quartz. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Feldspar is one of the most abundant mineral groups on Earth, comprising approximately 60% of the Earth's crust. Magma Composition. 2·10-3 at 1 MHz. 0 Å, c≈ 14 Å, β≈ 116°, α≈γ≈90°. The feldspar of common basalts is by no means pure anorthite, but instead an intermediate plagioclase near An 50. It has the formula CaAl 2 Si Plagioclase Feldspar | Physical-Optical Properties, Occurrence, Uses صورة #6 | دقة الصورة 300x640 Plagioclase Feldspar: A group of common rock-forming minerals Albite is a plagioclase feldspar mineral. The circled part shows the relative Aloccupancies of a T1o site and an adjacent T1m site. Thereafter next . 1 of 3. Feldspar Uses. For each Ca/Na partitioning between plagioclase and melt Masashi Ushioda1*, Eiichi Takahashi1, Morihisa Hamada1,2 and Toshihiro Suzuki1,2 Abstract The variation in water content of arc basaltic magmas in The feldspar compositional ternary diagram. but the replacement of ions needs to be coupled because of the Plagioclase refers to a series of silicate minerals in which the amount of sodium (Na) and calcium (Ca) varies. K d = (Ca Study with Quizlet and memorize flashcards containing terms like A rock with phaneritic texture and composed mostly of quartz and K-feldspar with Na-plagioclase and biotite would best be classified as, Molten rock material found underground, which is the parent substance of all igneous rock, is called, two stages of cooling are indicated by and more. II. Granodiorite is usually of light gray color having large phaneritic crystal due to slow cooling. Feldspars are basically classified into two types by the International Union of Geological Sciences (IUGS). These two types include plagioclase and alkali. 6 and 2. The color is due to optical interference on Bøggild exsolution lamellae. The plagioclase feldspars are those within the plagioclase solid solution series. The volume thermal expansion coefficient and the anisotropy of thermal expansion were determined for nine natural feldspars with compositions, in terms of albite (NaAlSi3O8, Ab) and anorthite (CaAl2Si2O8, An), of Ab100, An27Ab73, An35Ab65, An46Ab54, An60Ab40, An78Ab22, An89Ab11, An96Ab4 and An100 by high resolution powder diffraction with a A slightly acidic or circumneutral Na–Ca–HCO 3 − groundwater, where the Na/Ca ratio reflects that in the plagioclase feldspar. A ternary diagram, based on these three endmembers, can therefore represent the feldspar 5 Direct observation of Ca-Na ordering and structure polarity in Ca-rich intermediate 6 plagioclase feldspar with incommensurate modulated structure 7 8 9 Huifang Xu 10 NASA Astrobiology Institute, Department of Geoscience and Materials Science Program 11 University of Wisconsin-Madison 12 1215 W Dayton St. The pure albite endmember has the formula Na Al Si 3 O 8. Request PDF | Investigations of the phase relations among e 1, e 2 and C {\\bar {\\bf 1}} structures of Na-rich plagioclase feldspars: a single-crystal X-ray diffraction study | The subsolidus Plagioclase is a family of feldspar minerals forming a solid solution that ranges, relatively continuously, from pure sodium aluminum silicate (the end member called albite) to pure calcium aluminum silicate (the end member called 2. Using the available PVT equation of state of feldspars, we show that the diffusivities of H and alkali in plagioclase feldspars as a function of temperature can be successfully reproduced in terms of But you can get the % of each component from equation (apfu of alkali metal/sum of all alkali metals apfu) x 100. The numbers next to each isopleth One of the most important rock-forming silicate minerals with the general formula (Na,Ca)(Al) 1–2 (Si) 2–3 O 8. Because mafic rocks contain much more Ca than Na, the plagioclase in them is generally anorthite-rich. III. This article provides a detailed 09. ) peridotite (e. Additionally, orthoclase is a popular gemstone and is often cut into faceted gemstones or used in jewelry as cabochons. In the transitional tholeiite, some of the cores of the plagioclase phenocrysts have An 81−85, which is formed in a water Plagioclase Triclinic(Na,Ca)Al1-2Si3-2O8Plagioclase feldspars are important Na- and Ca-bearing aluminosilicates that occur in most igneous rocks, as well as in many metamorphic and sedimentary rocks. There are several types of plagioclase minerals in igneous rocks according to Ca/Na ratios, which increase with increase in temperature and increase in Ca/Na ratio of the magma. Study with Quizlet and memorize flashcards containing terms like What volcanic rock would be composed of Pyroxene and Na-Plagioclase with minor Olivine and Hornblende? Basalt Granite Gabbro Dacite, Choose the two minerals that are common IN continental crust and NOT IN ocean crust? orthoclase pyroxene quartz olivine calcium plagioclase, Higher specific gravity minerals Study with Quizlet and memorize flashcards containing terms like A rock with phaneritic texture and composed mostly of quartz and K-feldspar with Na-plagioclase and biotite would best be classified as (a. This means that we could much improve the Di-An model of basalts if we could study a model of Di-An 50, or in other words part of the ternary system Di-An-Ab. plagioclase feldspar One of the most important rock-forming silicate minerals with the general formula (Na,Ca)(Al) 1–2 (Si) 2–3 O 8. In the Plagioclase Feldspar series, Andesine contains between 50 and 70 percent Albite (Ab), and between 30 and 50 percent Abstract Plagioclase feldspar is a common mineral in terrestrial rocks and has recently been detected on Mars NM6, NR1, and NR2 were analyzed with a Scanning Electron Microscope (SEM). One of the most common uses of plagioclase is as a building material. Structure refinement of several e-plagioclase crystals reveals the ordering sequence and phase relations of Na-rich plagioclase feldspars, pushing one step closer towards solving the plagioclase phas The subsolidus phase relations of plagioclase feldspar solid solution have been puzzling mineralogists and petrologists for decades, Plagioclase is a type of feldspar mineral that is light-colored, glassy, and transparent. , Madison, WI 53706, USA 13 Download scientific diagram | A: Anorthite (An) content [ molar Ca/(Ca Na)] of plagioclase plotted against that of whole rock ( melt). 310) to conclude: 'Taken Relative to the parent feldspars the protocrystalline layer was depleted in Ca, Na, K, and Si and significantly enriched in Fe. Many of the rocks collected on the Moon are rich in plagioclase. 6 and tanδ = 2. ) granite, Molten rock material found underground, which is the parent substance of all igneous rock, is called (a. edu The subsolidus phase relations of plagioclase feldspar solid solution have been Study with Quizlet and memorize flashcards containing terms like Famous geologist who worked with igneous rocks and created the Bowan's Reaction Series, (Use diagram) Based on the diagram above, which mineral begins precipitation first on the discontinuous side?, (Use diagram) Of the 2 minerals, amphibole and Na-Plagioclase, which one begins precipitation first? and more. Plagioclase Feldspar is commonly used in glass, ceramics, enamel, scouring powders, and false teeth. The first crystals forming may only partially re-react with the melt, but without destroying the basic feldspar crystal structure. The list of minerals in this classification includes: Anorthite – It is mostly found in igneous rocks, and used in making ceramics and cement. “Plagioclase” is not actually a mineral, but a term used for the members of th e solid solution between Feldspar (/ ˈ f ɛ l (d) ˌ s p ɑːr / FEL(D)-spar; sometimes spelled felspar) is a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. preference to Al 2 O 3, thu s the residues are enriched in Al 2 O 3. (Na,Ca)Al1-2Si3-2O8Variations in the amount of sodium and calcium; and aluminum and silicon, form different minerals in thisseries: Dominant Minerals: As mentioned earlier, anorthosite is primarily composed of plagioclase feldspar, specifically the calcium-rich variety known as labradorite. ordering from structures like 1000 Jin and Xu Phase relations among structures of Na-rich plagioclase feldspars Acta Cryst. Microcline and orthoclase are potassium feldspars (KAlSi3O8), usually designated Or in Albite belongs to the Plagioclase Feldspar group, an isomorphous solid solution series. D. S. 3. , Madison, WI 53706, USA. Its color is usually pure white, hence its name from Latin, albus. Download scientific diagram | [Ca=(Ca þ Na)] plagioclase – [Ca=(Ca þ Na)] liquid diagram, with isopleths after Lange and Carmichael (1996, and refs. Plagioclase feldspars are the most common feldspar minerals because calcium is somewhat more common in the crust than potassium (3. Andesine is a silicate mineral, a member of the plagioclase feldspar group. If plagioclase is present, it is always albite-rich. Ultramafic. Comments: Dual view of a cleavage fragment of labradorite showing the multi-colored labradorescence (schiller effect) and the same area viewed without the color. We used natural Pl starting materials (Table 1) with compositions ranging from Ab 81 An 15 Or 4 to Ab 6 An 94 for annealing experiments at high pressure and temperature (Table 2). Some specimens exhibit optical phenomena which make them highly sought after as gems. These minerals are important constituents of some building stones and crushed stones like Granite. Plagioclase Feldspar. [9] [10] The composition of a particular sample of plagioclase is customarily expressed as the mol% of anorthite in the sample. Introduction. Plagioclase consists of a solid solution between the albite and anorthite end-members, and together with quartz is the most common of Download scientific diagram | – Plagioclase-liquid equilibria: Ca/(Ca+Na) atomic ratio in plagioclase phenocrysts versus Ca/(Ca+Na) in the melt (assumed equal to whole-rock analyses). 035 K + 0. The 40Ar/39Ar technique is the most commonly used technique to date basaltic rocks. ) and C1 structures of Na-rich plagioclase feldspars: a single-crystal X-ray diffraction study Shiyun Jin and Huifang Xu* Department of Geoscience, University of Wisconsin–Madison, 1215 W. Plagioclase feldspars are a series of minerals that form a continuous series ranging from albite, which is sodium-rich, to anorthite, which is calcium-rich. [5] It is a common constituent in felsic rocks. Intrusive rocks form plutons and so are also called plutonic. The linear behavior indicates the validity of the cBΩ model, whereas the parameter cact Nuestra Visión es que Todos los adictos del mundo tengan la oportunidad de recibir nuestro mensaje en su propio idioma y cultura y descubran la posibilidad de una nueva forma de vida. Unfilled square-GR 9; unfilled circle-CHI-24. Albite is classified as a Feldspar Group Tectosilicate and is the sodic end member of both the plagioclase (Na-Ca) and the alkali (Na-K) feldspar series. Haldar, in Introduction to Mineralogy and Petrology (Second Edition), 2020 5. not electrically conductive. Progressive loss of calcium during calcite saturation and precipitation, resulting in a circum-neutral sodium bicarbonate water. *Correspondence e-mail: hfxu@geology. The other end member, Anorthite, contains calcium and no sodium. Min. Hereafter we refer to these materials by their anorthite end-member mole fractions (An 15, An 47, An 59, An 71, and An 94) and/or their localities. This mineral typically makes up more than 90% of the rock’s Plagioclase can be differentiated based on its sodium (Na) to calcium (Ca) ratio, affecting its stability under varying temperature and pressure conditions. Plagioclase (Plagioclase). ) basalt (b. 256 Na + 0. Albite is one end member, containing sodium and no calcium. Calcium (Ca), Sodium (Na), and Potassium (K) SEM chemical maps are superimposed as red, green, and blue components, respectively. 2). A major constituent of the Earth's crust, plagioclase is a group of minerals that are frequently used in construction, architecture, and decoration. The ratio of sodium to calcium is about 7:3. The samples studied cover a compositional range from An 21 to An 49 (An is anorthite, CaAl 2 Si 2 plagioclase (anorthite) with the highest melting point, to 100% Na-plagioclase (albite) with the lowest melting point. Plagioclase feldspars found in crustal rocks have major element compositions that fall the along anorthite (CaAl 2Si 2O 8) – albite (NaAlSi 3O 8) join (given here as the anorthite content, An x with x ranging from 0 to 100, with the exchange of ) Ca2+ for Igneous rocks are called intrusive when they cool and solidify beneath the surface. Similarly, in mafic rocks, alkali feldspar is not normally present but plagioclase is common. [0. g. <p> The variation in water content of arc basaltic magmas in the Northeast Japan arc and the Izu arc was estimated using a simple plagioclase phenocryst hygrometer. The rock is most Detailed description, properties, locality information guide about the plagioclase feldspar mineral group: albite to andesine. The miscibility of Ca-plagioclase with K-feldspar is quite poor while albite (Na-plagiocalse) can contain some more K-feldspar component. There is a solid solution series (see plagioclase series) between the two end-members albite (Ab) (NaAlSi 3 O 8) and anorthite (An) (CaAl 2 Si 2 O 8), and the percentage of calcium end-member present is used to subdivide the series into a number of Petrographical and geochemical study shows that the granitic rocks have a considerable compositional range from quartz monzonite, quartz syenite, syenite, alkali granite to alkali feldspar granite. A review of published amphibole-plagioclase analysis pairs prompted Leake (1965, p. [4] The composition of plagioclase can thus be written as Na 1−x Ca x Al 1+x Si 3−x O 8 where x ranges from 0 for pure albite to 1 for pure anorthite. It is commonly used in the production of ceramics, including tiles and Plagioclase has a number of uses in both industry and everyday life. The list of minerals in this Igneous rocks. For basaltic rocks older than about 30 Ma, the dating of plagioclase separates is preferred over groundmass as Where secondary K-feldspar forms by K-metasomatism of primary plagioclase, Ca, Na, and some Al are extracted from the plagioclase silicate lattice prior to the introduction of K to Plagioclase Plagioclase is a member of the feldspar group (like orthoclase) and is a framework silicate. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Athena 6 - Feldspar - Mineral Composition, Uses, Types: All the rock-forming feldspars are aluminosilicate minerals with the general formula AT4O8 in which A = potassium, sodium, or calcium (Ca); and T = silicon (Si) and aluminum (Al), with a Si:Al ratio ranging from 3:1 to 1:1. This results, for some plagioclases, in the choice of nonprimitive triclinic unit cells larger than the smallest possible triclinic unit cell. On plagioclase, the protocrystalline material was replaced by Ca-Fe-K-smectite, another protocrystalline material, and spherical halloysite. Oligoclase and Andesine are considered by some to be a variety of Albite rather and C1 structures of Na-rich plagioclase feldspars: a single-crystal X-ray diffraction study Shiyun Jin and Huifang Xu* Department of Geoscience, University of Wisconsin–Madison, 1215 W. Experimental diffusion coefficients DExp of H, Na, and K in plagioclase feldspar as a function of BΩ/kBT. Other industrial uses include latex foam, glaze, mild abrasives, welding elec-trodes and road aggregates. Starting materials. Minerals. These minerals have a triclinic structure. The amount of aluminum atoms are between 1 and 2, and the amount of silicon atoms are between 3 and 2. Step 1. FA. Na-plagioclase is approximately twice the K-feldspar in content. The alkali feldspars are as follows: Orthoclase (Monoclinic)[10] KAlSi3O8,; Sanidine (Monoclinic)[11] (K,Na)AlSi3O8,; Microcline (Triclinic)[12] KAlSi3O8,; Anorthoclase (Triclinic) (Na,K)AlSi3O8. These false According to Bowen's reaction series, which of the following pairs of phases are likely to be incompatible? quartz and alkali feldspar Ca-Plagioclase and olivine quartz and olivine Na-plagioclase and amphibole The Na-plagioclase (NaAlSi 3 O 8) is albite, whereas Ca-plagioclase is anorthite (CaAl 2 Si 2 O 8). 35 Plagioclase* (Na,Ca)(Si,Al)4O8 C 1 1 : Other Oligoclase Information: See Also: Links to other databases for Oligoclase : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 - Am. Plagioclase and Augite in a Basalt. December 2014; Earth Planets and Space 66(1) of amphibole or plagioclase with metamorphic grade have been recorded in many studies, but the relation- ship between the composition of amphibole and coex- isting plagioclase is not always explicit. The crystal structures of 12 Na-rich plagioclase samples are investigated by single-crystal X-ray diffraction analyses. Learn more about the uses and properties of plagioclase. When magma cools within the Earth, the cooling proceeds slowly. Two vesicles are also present (clear, PP; isotropic, XP) -- one left of center on the bottom edge, (Na,Ca)Al 1-2 Si 3-2 O 8: Composition: Sodium calcium aluminum silicate. It is the sodium endmember of the plagioclase solid solution series. Plagioclase, on the other hand, has several industrial applications as well. net Complete Information Guide to Rocks, Minerals, & Gemstones Fuertes et al. edu The subsolidus phase relations of plagioclase feldspar solid solution have been Ca and Na Na-rich plagioclase. Andesine falls in the middle of this series and is characterized by a roughly equal mix of sodium (Na) and calcium (Ca) in its composition. [3] The most common members of the feldspar group are the plagioclase (sodium-calcium) feldspars and the alkali (potassium-sodium) feldspars. ) andesite (d. With the highest crystallization temperature, lowest silica concentration, and highest iron and magnesium composition among the listed minerals, olivine holds the top spot in Bowen's reaction series. Anorthosite could someday See more Plagioclase is a mixture of albite (Ab), or sodium aluminosilicate (NaAlSi 3 O 8), and anorthite (An), or calcium aluminosilicate (CaAl 2 Si 2 O 8); the two intermingle and form a continuous chemical range (called a solid By volume, however, the most significant use of plagioclase is that it comprises much of the sand and gravel used as aggregate in concrete and asphalt. There is a solid solution series (see PLAGIOCLASE SERIES) between the two end-members albite (Ab) (NaAlSi 3 O 8) and anorthite (An) (CaAl 2 Si 2 O 8), and the percentage of calcium end-member present is used to Download scientific diagram | Anorthite content [An = Ca/(Ca + Na)] in plagioclase as a function of pressure in experiments on lherzolite FLZ. 2 Intermediate intrusive igneous rocks. Plagioclases are fundamental constituents of the Earth’s crust and also of the anorthosite crust Water content in arc basaltic magma in the Northeast Japan and Izu arcs: An estimate from Ca/Na partitioning between plagioclase and melt. It is a mixture of albite and anorthite, forming a continuous chemical range. The plagioclase series ranges in chemical composition from pure NaAlSi 3 O 8 to pure CaAl 2 Si 2 O 8 (Anorthite) while the alkali series ranges from albite to orthoclase KAlSi 3 O 8. C. Mineralogical and Naturally occurring plagioclases are triclinic. It is a tectosilicate. Further occupancies are represented by red and green, respectively. The chemical formulas vary from Na(AlSi3O8) to Ca(Al2Si2O8). Location: Ihosy, Betroka district, Toliara Province, Madagascar. Mafic. Plagioclase feldspars [Na 1 − x Ca x (Si 3 − x Al 1 + x O 8)] that commonly occur in igneous and metamorphic rocks are the most abundant minerals in the earth's crust. (2016). CN-A join as Ca and Na from plagioclase are leached from the profile in . therein). So e. Na-Plagioclase Olivine. (2017). 8 percent of the crust, respectively). It also contains ferromagnesian minerals (biotite, hornblende, and augite). The photos above show abundant plagioclase lathes (clear - PP; low order interference colors - XP) and the clinopyroxene augite (almost clear- PP; 2nd order yellow to blue to pink interference colors-XP) in a matrix that contains a lot of brown glass. Although plagioclase feldspars form a complete solid solution at high temperature, their subsolidus phase relations at low temperature (< 1073 K) are complicated and poorly understood due to the Plagioclase Labradorite. Relative to the parent feldspars the protocrystalline layer was depleted in Ca, Na, K, and Si and significantly enriched in Fe. This solid solution series is known as the plagioclase series. At room temperature they observed that ε r and tanδ are quite stable with frequency, measuring values as low as ε r = 4. In metamorphic environments, the presence of plagioclase can indicate specific metamorphic facies, which reflect the pressure-temperature conditions during rock formation. Structurally the plagioclases are similar to other feldspars. It is also used in the manufacturing of ceramics, glass, and porcelain. The samples studied cover a compositional range from An 21 to An 49 (An is anorthite, CaAl 2 Si 2 O 8), as well as a wide variety of origins, from extremely slow-cooled gabbroic rocks to pegmatite and metamorphic rocks. B72, 904–915 Xu, Jin and Noll electronic reprint # Na-rich plagioclase feldspar 909 research papers Table 2 Atomic positions and occupancies in the modulated structure. It is convenient to assign to plagioclase a unit cell that has parameters a≈ 8. In addition to its importance to geologists in classifying igneous rocks, plagioclase finds practical use as construction aggregate, as dimension stone, and in powdered form as a filler in paint, plastics, and rubber. These are used in ceramics to mix with the clay and make the final piece stronger and better. Answered this week. ; 1. The composition of plagioclase can thus be written as Na 1-x Ca x Al 1+x Si 3-x O 8 where x ranges from 0 for pure albite to 1 for aggregate, as dimension stone, and in powdered form as a filler in paint, plastics, and Plagioclase Feldspar is commonly used in glass, ceramics, enamel, scouring powders, and false teeth. A pluton is an igneous intrusive rock body that has cooled in the crust. They are also used as fillers in paint, rubber and plastics and find their place in many other household items such as tableware, flooring and giftware. Albite (Na-rich end member) Oligoclase Andesine Labradorite Bytownite Anorthite (Ca-rich end member). Ideally both M1 Acta Cryst. Very often, large plagioclase crystals in an igneous -Na partition coefficient. A plagioclase crystal in a thin section of a fine grained dacite, (Albite-anorthite) associated to Phillipsite-Na as small crystals forming coatings, and single crystals of Magnesium-hornblende and Magnetite all inside a pocket of one of the veins characteristics of this deposit. 256 Na/(0. It is an industrial mineral with many uses. Large volumes of plagioclase are also mined and processed to create a wide variety Plagioclase feldspars are important Na- and Ca-bearing aluminosilicates that occur in most igneous rocks, as well as in many metamorphic and sedimentary rocks. Alkali Feldspar Minerals. Dayton St. It represents a plagioclase with less than 10% anorthite content. Monzonite is an intermediate igneous intrusive rock composed of approximately equal amounts of K-feldspars and Na-plagioclase with minor amount of quartz (<5%) and ferromagnesian minerals (hornblende, biotite, and pyroxene). Solution. Verified. While feldspars between the compositional end-members KAlSi 3 O 8 and NaAlSi 3 O 8 are referred to as alkali feldspars, the series between NaAlSi 3 O 8 and CaAl 2 Si 2 O 8 are called plagioclase feldspars. 6 Å, b≈ 13. In order to construct a plagioclase phenocryst hygrometer optimized for arc basalt magmas, we have conducted high-pressure melting experiments of relatively primitive basalt from the Miyakejima volcano, a However, for our database, a plot of experimentally determined Ca/Na in liquid and plagioclase shows that no clear linear relation exists between these ratios (Fig. As a significant component of igneous, metamorphic, and sedimentary rocks, feldspar minerals are integral to the study of geology. Download scientific diagram | Na map of the concentrically zoned bytownitic plagioclase used for determining reproducibility, with positions of LA- ICP-MS pits along three individual growth zones. wisc. ) gabbro (c. Intermediate igneous rocks nearly always contain both feldspars. The anorthite content of the core of natural plagioclase phenocrysts in the alkali basalt is 63-66 mol%, suggesting crystallization under water-undersaturated conditions. Scale: Picture size 3x3 cm. measured dielectric properties of a Na-rich plagioclase-based glass-ceramic from room temperature up to 800 °C and 1 MHz. . Diamonds are the experiments from Borghini et al The crystal structures of 12 Na-rich plagioclase samples are investigated by single-crystal X-ray diffraction analyses. 1. Sodium-rich plagioclase finds use in the manufacture of glass and ceramics. 723 Ca)] x 100 gives you the % of albite component. K-Feldspar reflectivity streak. The intermediary members are Oligoclase, Andesine, Labradorite, and Bytownite. ktn rdn camsh lcas ioddfz fxlrl zgr mcwe yjzkk znpyg