28 reactions · 8 comments | Biotite Granite Biotite granite is a...
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FacebookNC Gideon
Exploring Biotite: The Heat-Resistant Mineral | Rocks & Crystals
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Granite or Pegmatite? Picked from a field site, this coarse-grained rock shows pink feldspar crystals with shiny flakes of mica, classic features of a granitic material. The pink hue is from potassium feldspar (microcline/orthoclase), while the sparkle comes from muscovite and biotite. Such rocks form from slow cooling of magma deep in the crust, often marking continental crustal zones that may host rare metals or gem minerals in pegmatitic varieties. Possible rock type: Muscovite Granite or Peg
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Granite or Pegmatite? Picked from a field site, this coarse-grained roc…
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FacebookNC Gideon
Metamorphic Biotite Mica Schist ID'd
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Macro of a quartz-biotite gneiss with quartzitic crystalline layers and zincblende inclusions in a dark rock matrix.
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Biotite is a common ferromagnesian mica occurring in igneous and metamorphic rocks. Its iron–magnesium composition varies with pressure–temperature conditions, making it an important index mineral for assessing metamorphic grade and in deciphering tectono-thermal evolution of the continental crust. #GeologicalSurveyofIndia #MineraloftheWeek #Biotite #Mica #GeoPedia #Geologykefunde | Geological Survey of India
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Biotite tutorial Optical mineralogy
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This kyanite schist thin section contains the minerals garnet, bioti…
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