metamorphic
Mica schist
Mica-rich schist, likely biotite schist (dominantly biotite mica, with possible quartz and feldspar)
AI-generated identification · may be incorrectDark brown to black, strongly foliated and flaky, with a shiny to pearly luster and platy mica crystals; mica hardness is about 2.5–3, while the rock’s hardness varies with its other minerals. The image suggests mica-rich foliation, but does not establish the exact mineral mix.
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Physical properties
Dark brown to black, strongly foliated and flaky, with a shiny to pearly luster and platy mica crystals; mica hardness is about 2.5–3, while the rock’s hardness varies with its other minerals. The image suggests mica-rich foliation, but does not establish the exact mineral mix.
Formation & geological history
Forms when mica-bearing rocks undergo heat and directed pressure during regional metamorphism; age and precise formation setting cannot be determined from the image.
Uses & applications
Used as a teaching and collecting specimen; mica has industrial uses as an electrical and thermal insulator, though this small foliated piece is not a typical construction stone.
Geological facts
Schistosity is the aligned arrangement of visible platy minerals, which gives schist its layered, glittering appearance.
Field identification & locations
Look for abundant visible mica flakes aligned in wavy layers; schist occurs in metamorphic mountain belts worldwide. A photo alone cannot confirm whether the dark mica is biotite or identify minor minerals.
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