igneous
Weathered granite cobble
Granite; predominantly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, mottled pink-brown and gray, with a granular texture and dull to slightly glassy luster; hardness about 6–7 Mohs, no strong cleavage as a whole, and typical specific gravity 2.63–2.75.
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Physical properties
Coarse-grained, mottled pink-brown and gray, with a granular texture and dull to slightly glassy luster; hardness about 6–7 Mohs, no strong cleavage as a whole, and typical specific gravity 2.63–2.75.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep in Earth’s crust, commonly during Precambrian to Phanerozoic continental plutonism; surface weathering rounded the cobble and darkened its exterior.
Uses & applications
Widely used for building stone, monuments, countertops, paving, aggregate, and landscaping; this small weathered specimen has modest educational or collection value.
Geological facts
Pink areas are generally potassium feldspar, translucent grains are quartz, and dark flecks are biotite or hornblende. The image alone cannot confirm the exact granite variety.
Field identification & locations
Identify it by visible interlocking quartz and feldspar grains, pink coloration, and scattered dark mica; it is common in granite terrains and glacial or stream deposits worldwide.
