igneous
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica
AI-generated identification · may be incorrectThe specimen appears coarse-grained and mottled brown, cream, and gray, with a granular texture. Typical granite minerals have Mohs hardness of about 6–7 (quartz); the rock has no consistent cleavage and a specific gravity around 2.6–2.7.
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Physical properties
The specimen appears coarse-grained and mottled brown, cream, and gray, with a granular texture. Typical granite minerals have Mohs hardness of about 6–7 (quartz); the rock has no consistent cleavage and a specific gravity around 2.6–2.7.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, allowing visible crystals to grow. It forms in many geological periods; the image alone cannot establish its age.
Uses & applications
Granite is widely used as dimension stone, countertops, paving, monuments, and aggregate; attractive pieces may be collected or cut for display.
Geological facts
Its visible interlocking crystals are evidence of slow underground cooling. The image suggests granite, though exact mineral identification would require closer inspection.
Field identification & locations
Look for interlocking light feldspar, glassy quartz, and dark mica or amphibole grains; common sources include continental mountain belts worldwide. Estimated value: about $1–$10 for a small unpolished common specimen; more if unusually attractive or documented.
