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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Why is biotite called a ferromagnesian mineral, while muscovite... | Filo
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Gneiss (pronounced (nice) is a foliated metamorphic rock characterized by distinct banding or layering, caused by the segregation of light- and dark-colored minerals. Appearance * Shows alternating light and dark bands * Light bands:mostly ,quartz and feldspar* * Dark bands: contain biotite, hornblende, or pyroxene * Often coarse-grained and very hard. Formation (Metamorphism) Gneiss forms through: 1. Regional metamorphism: deep burial and compression over large areas, such as mountain belts. 2.
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Park rangers at Black Rock Mountain State Park captured video of a significant cliff collapse earlier this week. The footage shows a large section of the dark-colored biotite gneiss rock face breaking away and crashing into the valley below. Officials say no injuries were reported, and the affected trail section has been temporarily closed as a precaution. - Callie 👉 #BlueRidge #BreakingNews #BlackRockMountain #CliffCollapse #ViewerVideo #CaughtOnCamera #GeorgiaMountains #OnlyInBlueRidge #Local
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The hill is intensely cut by quartz–pegmatite veins intersecting at multiple angles, hosted within muscovite–biotite gneiss ;a strong structural and lithological setting for pegmatite-related mineralization. #Pegmatite #QuartzVeins #Gneiss #Muscovite #Biotite #StructuralGeology #LithiumPegmatite #MineralExploration #FieldGeology #NCGideon | NC Gideon
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