igneous
Mica-bearing granite or granitic pegmatite fragment
Quartz–feldspar–mica aggregate, likely biotite granite; exact identification requires testing
AI-generated identification · may be incorrectCoarse, irregular grains with white/gray feldspar or quartz and dark mica; vitreous to pearly luster, no obvious cleavage in the whole specimen. Typical hardness is about 6–7 for quartz/feldspar, with softer, cleavable mica around 2–3; specific gravity roughly 2.6–2.8.
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Physical properties
Coarse, irregular grains with white/gray feldspar or quartz and dark mica; vitreous to pearly luster, no obvious cleavage in the whole specimen. Typical hardness is about 6–7 for quartz/feldspar, with softer, cleavable mica around 2–3; specific gravity roughly 2.6–2.8.
Formation & geological history
Formed by slow cooling of silica-rich magma underground, allowing visible crystals to grow; granite ranges from Precambrian to Cenozoic in age and occurs in continental crust worldwide.
Uses & applications
Used as crushed aggregate, building stone, countertops, monuments, and landscaping material; small fragments have modest collecting value.
Geological facts
The dark flakes are probably biotite mica, while the pale grains are likely quartz and feldspar. A glassy quartz grain scratches ordinary glass, whereas mica splits into thin elastic sheets.
Field identification & locations
Common in granitic terrains, mountain ranges, quarries, and stream gravels. Confirm with a hand lens, streak and hardness tests, and inspection for feldspar cleavage; the photo alone cannot distinguish granite from pegmatite confidently.
