igneous
Granite (likely weathered granitic rock)
Granite; primarily quartz (SiO₂), feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse-grained, mottled gray-green and white, with a granular crystalline texture and generally vitreous to dull luster. Typical hardness is about 6–7 Mohs; cleavage occurs in feldspar, while quartz lacks cleavage; specific gravity is roughly 2.63–2.75.
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Physical properties
Coarse-grained, mottled gray-green and white, with a granular crystalline texture and generally vitreous to dull luster. Typical hardness is about 6–7 Mohs; cleavage occurs in feldspar, while quartz lacks cleavage; specific gravity is roughly 2.63–2.75.
Formation & geological history
An intrusive igneous rock formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic continental uplift and erosion. The surface appears weathered, possibly from feldspar alteration.
Uses & applications
Used widely as dimension stone, countertops, monuments, aggregate, and paving; small unexceptional fragments have minimal commercial value.
Geological facts
The visible interlocking grains indicate crystallization underground rather than volcanic cooling. Greenish tones may reflect altered feldspar, chlorite, or amphibole, so precise identification would require a fresh surface or microscopy.
Field identification & locations
Identify it by visible interlocking quartz/feldspar grains, lack of vesicles, and a hard, scratch-resistant surface; common in continental mountain belts and glacial or stream gravels. Estimated value: $1–$10 for a small common specimen, higher only if unusually attractive or locality-labeled.
