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</html>";s:4:"text";s:12089:"To be updated with all the latest minerals and rocks under the microscope. The specific gravity in each member (albite 2.62) increases 0.02 per 10% increase in anorthite (2.75). Pyroxene (wholly igneous) relicts are augite with a composition ranging from Wo 43 En 44 Fs 13 to Wo 45 En 39 Fs 17 . Colorless in thin section; Grains may appear cloudy due to alteration. RI - 1.527-1.590. Mineral. In thin section, plagioclase commonly shows the characteristic albite polysynthetic twinning. There are several phenocrysts of brown to green pyroxene, magnetite, and plagioclase. I-50 Cleavage. In thin section the plagioclase crystals show a distinctive cream coloured clouding, probably due to oriented inclusions of spinel (Poldervaart and Gilkey, 1954). Key optical features of plagioclase in thin section: Colourless Low relief Low order interference colours Multiple twinning (often untwinned in low to medium grade metamorphic rocks) Common minerals that might be confused with plagioclase and occur in similar rocks: K-feldspar (either simple or polysynthetitc twinning, perthitic texture), Colour and Pleochroism. Plagioclase in hand samples is often identified by its polysynthetic crystal twinning or 'record-groove' effect. This twinning is the most characteristic identifying feature of plagioclase, and makes its … Plagioclase feldspar thin section.The series ranges from albite to anorthite endmembers with respective compositions naalsi3o8 to caal2si2o8 where sodium and calcium atoms can substitute for each other in the mineral s crystal lattice structure. Framework Silicates. Plagioclase is also a major constituent of rock in the highlands of the Earth's moon. Rather than referring to a particular mineral with a specific chemical composition, plagioclase is a continuous solid solution series, more properly known as the plagioclase feldspar series. (2013). The series ranges from albite to anorthite endmembers (with respective compositions NaAlSi3O8 to CaAl2Si2O8), where sodium and calcium atoms can substitute for each other in the mineral's crystal lattice structure. Colour - colourless. triclinic (+,-) Relief - low. Plagioclase – (series of minerals in the feldspar group), from Greek for, Plagioclase distinguishing features under the microscope, Plagioclase (polysynthetic twinning) #1 thin section (hFOV 2mm), Plagioclase (polysynthetic twinning) #2 thin section (hFOV 2mm), Plagioclase (zonar structure) #1 thin section (hFOV 2mm), Plagioclase (zonar structure) #2 thin section (hFOV 2mm), Plagioclase (myrmekite) #1 thin section (hFOV 2mm). Birefringence - 0.012-0.013. In thin section or grain mount the general lack of pleochroism and the twinning are good indicators. In the solid solution series, the plagioclase refractive index varies from slightly lower than quartz to somewhat above it. The extinction angle is an optical characteristic and varies with the albite fraction (%Ab). Low negative or positive relief. Klein, Cornelis and Cornelius S. Hurbut, Jr.; Johann Friedrich Christian Hessel (1796–1872), rock in the highlands of the Earth's moon, https://en.wikipedia.org/w/index.php?title=Plagioclase&oldid=982515290, Short description is different from Wikidata, Articles containing Ancient Greek (to 1453)-language text, Creative Commons Attribution-ShareAlike License, Biaxial (+) albite, biaxial (-) anorthite, This page was last edited on 8 October 2020, at 16:50. Rocks under the Microscope. The following table shows their compositio… Relief. There are several named plagioclase feldspars that fall between albite and anorthite in the series. Plagioclase Feldspar (thin section) Type. The composition of a plagioclase feldspar is typically denoted by its overall fraction of anorthite (%An) or albite (%Ab), and readily determined by measuring the plagioclase crystal's refractive index in crushed grain mounts, or its extinction angle in thin section under a polarizing microscope. The following table shows their compositions in terms of constituent anorthite and albite percentages. Search for Plagioclase using: This was first shown by the German mineralogist Johann Friedrich Christian Hessel (1796–1872) in 1826. Some common rock types as seen under the microscope. Its name comes from Ancient Greek πλάγιος (plágios, "oblique") + κλᾰ́σῐς (klásis, "fracture"), in reference to its two cleavage angles. Plagioclase, unzoned, in a hornblende diorite. Analysis of thermal emission spectra from the surface of Mars suggests that plagioclase is the most abundant mineral in the crust of Mars.[3]. These are photomicrographs - very thin slices of rock, seen in plane-polarised light, or between crossed polarisers, when the colours seen are produced by interference of light. Deer, W. A., Howie, R. A., & Zussman, J. The intermediate members of the plagioclase group are very similar to each other and normally cannot be distinguished except by their optical properties. 11 - Minerals in Thin Section-University of North Carolina 12 - Minerals in Thin Sections-Humboldt State 13 - Online Mineral Museum 14 - QUT Mineral Atlas 15 - Ruff.Info 16 - UCLA - Petrography Thin-Sections 17 - WWW-MINCRYST. Cleavages intersect at 93 °, usually not observed in thin section. There are several named plagioclase feldspars that fall between albite and anorthite in the series. Plagioclase is a major constituent mineral in the Earth's crust, and is consequently an important diagnostic tool in petrology for identifying the composition, origin and evolution of igneous rocks. Plagioclase. A “thin section” of rock is a sample that is mounted to a microscope slide and cut so thin that you can see light through it. Plagioclase is a series of tectosilicate (framework silicate) minerals within the feldspar group. The glass colorless to light-brown, and hard to see with all the air bubbles entrained in the epoxy (bubbles in epoxy have thin, birefringent rims). Hekla volcano, Iceland. An introduction to the rock-forming minerals (pp. The composition of a plagioclase feldspar is typically denoted by its overall fraction of anorthite (%An) or albite (%Ab), and readily determined by measuring the plagioclase crystal's refractive index in crushed grain mounts, or its extinction angle in thin section under a polarizing microscope. Ateration to fine-grained material typically occurs along fractures, twin planes, or cleavages. Plane/cross-polarized light, field width is 3 mm. 498). Home Atlas of … ... 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