igneous
Weathered granite or granitic gneiss
Quartz–feldspar–mica granite; possibly gneiss if the faint foliation is genuine
AI-generated identification · may be incorrectCoarse, light gray rock with quartz and feldspar, dark mica/amphibole, granular texture, and locally weathered surfaces; hardness about 6–7 Mohs, vitreous to dull luster, no prominent cleavage as a whole, and specific gravity roughly 2.6–2.7.
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Physical properties
Coarse, light gray rock with quartz and feldspar, dark mica/amphibole, granular texture, and locally weathered surfaces; hardness about 6–7 Mohs, vitreous to dull luster, no prominent cleavage as a whole, and specific gravity roughly 2.6–2.7.
Formation & geological history
Likely crystallized slowly from silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic tectonic events; if metamorphic banding is confirmed, it represents recrystallized granite (gneiss).
Uses & applications
Commonly used as crushed aggregate, road stone, riprap, building stone, countertops, monuments, and landscaping material; this weathered specimen has little gem value.
Geological facts
Granite can weather into rounded boulders through spheroidal weathering, producing the irregular, softened surfaces visible here.
Field identification & locations
Identify it by visible quartz, pale feldspar, and scattered dark minerals in a coarse interlocking texture; a fresh broken surface and streak-free hardness test help distinguish it from concrete. Common worldwide, especially in continental shields and mountain belts.
