metamorphic
Likely mica schist
Mica-rich schist, likely muscovite/biotite with quartz and possibly feldspar
AI-generated identification · may be incorrectSilvery, foliated surface with brown weathering; visible platy mica gives a sparkly sheen. Mica is Mohs 2–3, quartz 7; exact composition and hardness cannot be confirmed from the image.
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Physical properties
Silvery, foliated surface with brown weathering; visible platy mica gives a sparkly sheen. Mica is Mohs 2–3, quartz 7; exact composition and hardness cannot be confirmed from the image.
Formation & geological history
Formed when clay-rich sedimentary or igneous rocks were recrystallized under heat and pressure, developing aligned mica; age depends on the locality and cannot be determined visually.
Uses & applications
Used locally as decorative stone or landscaping material; mica and associated minerals have industrial uses, though this small specimen is mainly for collecting.
Geological facts
Schistosity is the layered, glittering texture produced by aligned mica grains; the rock may split along these layers.
Field identification & locations
The elongated, parallel silvery flakes and foliation suggest mica schist. Confirm with a fresh surface and locality information; similar-looking foliated rocks can have different compositions.
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