igneous
Granite (likely weathered granite or granitic gneiss)
Granite; chiefly quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pale gray with black mineral flecks, weak vitreous-to-dull luster, and no obvious cleavage as a whole; constituent minerals are typically Mohs 2–7, with specific gravity about 2.6–2.7.
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Physical properties
Coarse-grained, pale gray with black mineral flecks, weak vitreous-to-dull luster, and no obvious cleavage as a whole; constituent minerals are typically Mohs 2–7, with specific gravity about 2.6–2.7.
Formation & geological history
Formed by slow cooling of silica-rich magma deep in the continental crust, commonly during Precambrian to Phanerozoic mountain-building events; surface weathering rounded this specimen.
Uses & applications
Widely used as dimension stone, countertops, monuments, paving, aggregate, and landscaping rock; ordinary loose specimens have minimal commercial value.
Geological facts
Granite’s visible speckling reflects interlocking quartz, feldspar, and dark mica or amphibole crystals. The exact identification is uncertain from the photograph alone because grain boundaries are poorly resolved.
Field identification & locations
Look for a hard, granular, speckled texture and pink, white, or gray feldspar alongside translucent quartz and black mica; it should not fizz with dilute acid. Common worldwide, especially in continental shields and mountain belts.
