igneous
Granite (likely weathered granitic rock)
Granitic rock, chiefly quartz + feldspar + mica (variable composition)
AI-generated identification · may be incorrectCoarse, speckled gray-white texture with dark mica or amphibole grains; vitreous quartz and feldspar luster are subdued by weathering. Hardness about 6–7 Mohs, massive with no cleavage as a whole, and typically specific gravity 2.6–2.8.
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Physical properties
Coarse, speckled gray-white texture with dark mica or amphibole grains; vitreous quartz and feldspar luster are subdued by weathering. Hardness about 6–7 Mohs, massive with no cleavage as a whole, and typically specific gravity 2.6–2.8.
Formation & geological history
Slow cooling of silica-rich magma deep within continental crust, commonly forming Precambrian to Paleozoic plutons; later exposed by uplift and erosion. The reported Vologda-region location is geologically plausible for glacially transported granitic material from the Fennoscandian Shield.
Uses & applications
Widely used as crushed stone, aggregate, paving, monuments, countertops, and building stone; this small weathered piece has little commercial or jewelry value.
Geological facts
The pale grains are probably feldspar and quartz, while black grains are biotite or hornblende. It may alternatively be a closely related granodiorite, which cannot be distinguished confidently from this photograph alone.
Field identification & locations
Look for interlocking visible crystals, pale feldspar, gray translucent quartz, and scattered dark mica. A glassy streak is absent; acid testing is usually negative or only weakly reactive. Common as glacial erratics around northwestern Russia.
