igneous
Likely granitic rock fragment
Granite or granodiorite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, light gray to pinkish, with visible interlocking translucent quartz and pale feldspar; likely Mohs 6–7, glassy to dull luster, no obvious cleavage as a whole rock, and specific gravity about 2.6–2.8.
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Physical properties
Coarse-grained, light gray to pinkish, with visible interlocking translucent quartz and pale feldspar; likely Mohs 6–7, glassy to dull luster, no obvious cleavage as a whole rock, and specific gravity about 2.6–2.8.
Formation & geological history
An intrusive igneous rock formed by slow cooling of silica-rich magma deep in the crust, generally during Precambrian to younger continental-crust events; the small fragment may be naturally weathered or broken.
Uses & applications
Commonly used as dimension stone, countertops, monuments, aggregate, and landscaping material; small pieces have minimal jewelry or collector value.
Geological facts
The apparent “salt-and-pepper” texture results from crystals large enough to see without magnification. A strong fizz with dilute acid would suggest carbonate contamination rather than typical granite.
Field identification & locations
Identify it by its visible quartz, feldspar, and dark mica/hornblende grains, lack of layering, and hard scratch resistance; common worldwide in continental mountain belts and exposed plutons.
