igneous
Granite (likely weathered granitic rock)
Granite; predominantly quartz, K-feldspar, plagioclase, and mica
AI-generated identification · may be incorrectCoarse-grained, speckled gray-and-pink appearance with a granular texture and probable quartz/feldspar crystals; hardness about 6–7 Mohs, vitreous to dull luster, no obvious cleavage as a whole rock, and specific gravity roughly 2.6–2.8.
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Physical properties
Coarse-grained, speckled gray-and-pink appearance with a granular texture and probable quartz/feldspar crystals; hardness about 6–7 Mohs, vitreous to dull luster, no obvious cleavage as a whole rock, and specific gravity roughly 2.6–2.8.
Formation & geological history
A plutonic igneous rock crystallized slowly from silica-rich magma deep in Earth’s crust, commonly during Precambrian to Phanerozoic mountain-building events; the specimen is visibly weathered and possibly fractured.
Uses & applications
Widely used as dimension stone, countertops, paving, monuments, aggregate, and landscaping rock; ordinary hand specimens have little jewelry value.
Geological facts
Granite’s large interlocking crystals indicate slow underground cooling. Its quartz and feldspar grains commonly weather into sand and clay minerals.
Field identification & locations
Identify it by visible interlocking light and dark grains, abundant quartz/feldspar, and lack of layering or vesicles; common worldwide in continental shields and mountain belts.
