igneous
Likely weathered granite or granitic pegmatite
Granite; chiefly quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectCoarse, irregular granular texture with pale gray feldspar/quartz and darker mica or altered minerals; vitreous to dull luster. Typical hardness is about 6–7 Mohs, with no strong cleavage as a whole, though feldspar and mica grains cleave.
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Physical properties
Coarse, irregular granular texture with pale gray feldspar/quartz and darker mica or altered minerals; vitreous to dull luster. Typical hardness is about 6–7 Mohs, with no strong cleavage as a whole, though feldspar and mica grains cleave.
Formation & geological history
Formed by slow crystallization of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic intrusive events; the specimen appears surface-weathered and possibly iron-stained.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, and decorative material; ordinary hand specimens have little commercial value.
Geological facts
Granite is an intrusive igneous rock whose visible crystals indicate slow cooling. Exact identification is limited by the small, weathered photograph; it could also be a feldspar-rich metamorphic or pegmatitic fragment.
Field identification & locations
Look for interlocking visible crystals of quartz, feldspar, and mica; quartz is typically glassy and gray, feldspar opaque and blocky, and mica forms reflective flakes. Common worldwide, especially in continental shields and mountain belts.
