igneous
Granite (likely weathered or cut fragment)
Granite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectLight gray, coarse-grained, with black mica/amphibole flecks and pale feldspar; typically vitreous to dull luster, interlocking crystals, no cleavage as a whole. Mohs hardness about 6–7; specific gravity 2.63–2.75. The image is consistent with granite, though exact identification is limited by scale and lighting.
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Physical properties
Light gray, coarse-grained, with black mica/amphibole flecks and pale feldspar; typically vitreous to dull luster, interlocking crystals, no cleavage as a whole. Mohs hardness about 6–7; specific gravity 2.63–2.75. The image is consistent with granite, though exact identification is limited by scale and lighting.
Formation & geological history
A slowly cooled intrusive igneous rock formed from silica-rich magma, commonly during continental mountain-building. Granite bodies range from Precambrian to recent geologic ages; this fragment may be naturally weathered or human-cut.
Uses & applications
Widely used for countertops, monuments, building stone, paving, aggregate, and landscaping; attractive polished pieces are collectible but generally inexpensive.
Geological facts
Its visible speckled texture reflects crystals that grew underground over long periods. Black grains may be biotite mica or hornblende, while the white grains are mainly feldspar and quartz.
Field identification & locations
Check for clearly interlocking grains, pale quartz/feldspar, and scattered dark minerals; granite is common in continental uplands and quarry regions worldwide. A fresh broken surface is more diagnostic than the weathered exterior.
