igneous
Weathered granite or granitic gneiss pebble
Granite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectHardness about 6–7 Mohs; gray-beige, coarse granular texture with scattered dark mica and weak vitreous sparkle. No obvious cleavage as a whole rock; individual feldspars may show cleavage, and specific gravity is typically 2.6–2.7.
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Physical properties
Hardness about 6–7 Mohs; gray-beige, coarse granular texture with scattered dark mica and weak vitreous sparkle. No obvious cleavage as a whole rock; individual feldspars may show cleavage, and specific gravity is typically 2.6–2.7.
Formation & geological history
Likely crystallized slowly from silica-rich magma deep in the crust, then exposed by uplift and erosion; commonly Precambrian to Mesozoic in age. The rounded shape and worn surface indicate stream, beach, or glacial transport.
Uses & applications
Used as crushed aggregate, building stone, paving, monuments, and countertops; this small ordinary pebble has minimal commercial or collector value.
Geological facts
Its light minerals are probably quartz and potassium/plagioclase feldspar, while dark flecks are biotite or hornblende. Surface weathering has muted the original contrast and produced the tan-brown coloration.
Field identification & locations
Identify it by its interlocking visible grains, quartz-like sparkles, pale feldspar, and dark mica; it is not likely a meteorite because it lacks a fusion crust and metallic appearance. Common worldwide in continental crust and sediment deposits.
