Mineral types; Quartz. To link to this object, paste this link in email, IM or document To embed this object, paste this HTML in website. Muscovite thin section photomicrographs are taken in plane-polarized light and cross-polarized light, and can easily be recognized under the microscope. No matter how dark muscovite gets, fresh biotite is distinctly darker. Biotite in thin section under cross-polarized light. Point Group: 2=m: Crystals six-sided, thick tabular to … Atlas of Metamorphic Minerals. Myrmeckite. 20 - Minerals in Thin Section-University of North Carolina 21 - Minerals in Thin Sections-Humboldt State 22 - Online Mineral Museum 23 - Philatelic Mineralogy 24 - QUT Mineral Atlas 25 - Ruff.Info 26 - Scandinavian mineral gallery 27 - UCLA - Petrography Thin-Sections 28 - WWW-MINCRYST. Occurrence: Biotite is common in a … These sheets of biotite are as thin as in the first muscovite photo above, but they are black and shiny, not silvery and shiny. PPL. It is also sometimes called "black mica" as opposed to "white mica" (muscovite). Muscovite. It is an important rock-forming mineral present in igneous, metamorphic, and sedimentary rocks. Great big black holes. Phlogopite KMg3Si3AlO10(F;OH)2 °c 2001 Mineral Data Publishing, version 1.2 Crystal Data: Monoclinic.
Muscovite in Thin Section Thin Section GigaPans Muscovite has a Mohs hardness of 2–2.25 parallel to the  face, 4 perpendicular to the  and a specific gravity of 2.76–3. Plane-polarized light, field widths are 0.3 mm. It can be colorless or tinted through grays, browns, greens, yellows, or (rarely) violet or red, and can be transparent or translucent. Has micaceous habit and dark color. Colour - colourless. Chlorite: Chlorite is another mica mineral that might be confused with muscovite, but chlorite usually has a very distinctive green color. 784. Tabular muscovite crystals in a gneiss in thin section viewed under cross-polarized light at 2x magnification. The black, gray, and white grains are mostly silt or smaller size grains of quartz and feldspar.
Basal sections of biotite in thin section are typically approximately hexagonal in shape and usually appear isotropic under cross-polarized light. Characteristic of deep-seated siliceous igneous rocks as granite and syenite. Pyroxenes. Muscovite is a widespread and very common rockforming mineral. This grain has developed a light-brown radiation halo in the adjacent garnet. Muscovite is the most common mineral of the mica family. 2 Olivine: forsterite Olivine: Forsterite, in marble. For Jean Baptiste Biot (1774-1862), French physicist, who studied the optical differences between the micas. The important thing here is that the black holes aren’t totally obscuring the micaceous cleavage.) Relief is much higher than muscovite, which surrounds the kyanite. Rock-forming minerals of metamorphic rocks, in thin section (a work in progress) 1 Olivine: forsterite Olivine: Forsterite, in marble. Click to see a rollover image that shows the twinning as the thin section is rotated and gives a better view of the "birds-eye" extinction. Interference colours - 3rd order Muscovite is very light colored to colorless, while biotite is much darker (typically brown to black). Especially characteristic of pegmatite dikes, and found lining cavities in granites, where it has evidently been formed by the action of mineralizing vapors during the last stages of the formation of the rock. Share. Mica; Sheet Silicates. Right: Monazite oriented N-S. Monazite can be very pale yellow-green in thin section. Alex Strekeisen - I vetrini della mia fantasia. Muscovite - K 2 Al 4 [Si 6 Al 2 O 20](OH,F) 4 The name muscovite comes from Muscovy-glass, a name given to the mineral in Elizabethan England due to its use in medieval Russia as a cheaper alternative to glass in windows. It also cleaves into inelastic flakes, rather than the thin flexible sheets of muscovite. Accessory minerals. Plagioclase. Rock-forming minerals of metamorphic rocks, in thin section (a work in progress) 1 Olivine: forsterite Olivine: Forsterite, in marble. Guidotti (1984) and others called slightly hypersilicic muscovite "phengitic muscovite" or simply phengite when Si was greater than 3.5 pfu. The garnet has grown by replacing, displacing, and including the mineral grains of the surrounding rock. Muscovite sheets have a pearly to vitreous luster on their surface. Add tags Comment Rate.
Formula: K(Mg,Fe) 3 (AlSi 3 O 10)(F,OH) 2 System: Monoclinic Color: Brown, gray, green, yellow, or reddish brown Lustre: Vitreous, Pearly Hardness: 2–3 Density: 2.7–3.3. Twitter. 20 - Minerals in Thin Section-University of North Carolina 21 - Minerals in Thin Sections-Humboldt State 22 - Online Mineral Museum 23 - Philatelic Mineralogy 24 - QUT Mineral Atlas 25 - Ruff.Info 26 - Scandinavian mineral gallery 27 - UCLA - Petrography Thin-Sections 28 - WWW-MINCRYST. ... 94 Muscovite Muscovite (colourless), with biotite, garnet and kyanite in schist.
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