igneous
Likely weathered granite or granitic pebble
Granite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse crystalline texture with pale feldspar/quartz and darker mica or altered minerals; typically Mohs 6–7, nonmetallic luster, no obvious cleavage as a whole rock, and specific gravity about 2.6–2.7. The specimen appears rounded and weathered, with a possibly polished or wet surface.
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Physical properties
Coarse crystalline texture with pale feldspar/quartz and darker mica or altered minerals; typically Mohs 6–7, nonmetallic luster, no obvious cleavage as a whole rock, and specific gravity about 2.6–2.7. The specimen appears rounded and weathered, with a possibly polished or wet surface.
Formation & geological history
Formed by slow cooling of silica-rich magma deep in Earth’s crust, commonly during Precambrian to younger continental mountain-building events; later erosion rounded it into a pebble.
Uses & applications
Granite is widely used for countertops, monuments, building stone, aggregate, and landscaping; small attractive pieces are collected but usually have little commercial value.
Geological facts
Its visible grains indicate interlocking crystals rather than a glassy volcanic texture. The blue-white area may be reflected light or pale quartz/feldspar, so exact identification would require a close texture view or testing.
Field identification & locations
Look for visible quartz, pink/white feldspar, and black mica in a granular mosaic; it should resist scratching by a steel knife. Common in continental regions and stream gravels.
