igneous
Weathered granitic rock, likely granite or granodiorite
Granite–granodiorite; chiefly quartz, feldspar, and biotite/hornblende
AI-generated identification · may be incorrectCoarse, mottled brown-gray texture with visible interlocking mineral grains and no obvious layering or cleavage. Typical hardness is about 6–7 Mohs; vitreous quartz and dull feldspar produce a granular luster, with specific gravity roughly 2.6–2.8.
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Physical properties
Coarse, mottled brown-gray texture with visible interlocking mineral grains and no obvious layering or cleavage. Typical hardness is about 6–7 Mohs; vitreous quartz and dull feldspar produce a granular luster, with specific gravity roughly 2.6–2.8.
Formation & geological history
A slowly cooled intrusive igneous rock formed from magma deep in the crust, commonly Precambrian to Paleozoic in age. The brown surface is consistent with weathering and iron staining.
Uses & applications
Commonly used as crushed stone, aggregate, building stone, curbing, and monuments; attractive polished pieces may be used decoratively. This hand specimen has little commercial or collector value.
Geological facts
The image supports a broad identification rather than a precise mineral diagnosis because grain boundaries and composition are partly obscured by weathering. The reported southern Québec location is geologically plausible for granitic rocks and glacially transported granite.
Field identification & locations
Look for a salt-and-pepper or pink-gray interlocking texture, hardness greater than a steel nail, and no reaction to dilute acid. A streak test, fresh broken surface, and magnification would distinguish granite from granodiorite, gneiss, or weathered diorite.
