igneous
Small gray granitic rock fragment
Likely granite or granodiorite; quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectHardness about 6–7 Mohs; coarse speckled gray surface with dull to slightly granular luster. Interlocking crystals are suggested, but grain size and minerals are difficult to confirm from the image; cleavage is absent as a whole rock.
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Physical properties
Hardness about 6–7 Mohs; coarse speckled gray surface with dull to slightly granular luster. Interlocking crystals are suggested, but grain size and minerals are difficult to confirm from the image; cleavage is absent as a whole rock.
Formation & geological history
An intrusive igneous rock that crystallized slowly from silica-rich magma deep in the crust, commonly during Precambrian or younger continental events. The rounded shape likely results from weathering or handling.
Uses & applications
Used widely as crushed stone, aggregate, building stone, countertops, monuments, and landscaping material; this small fragment has negligible commercial value.
Geological facts
Granite is defined by abundant quartz and alkali feldspar, whereas granodiorite contains more plagioclase. A fresh broken surface and simple hardness tests would improve identification.
Field identification & locations
Common worldwide, especially in continental shields and mountain belts. Look for visible glassy quartz, white/pink feldspar, and black mica; it should not fizz with dilute hydrochloric acid unless carbonate contamination is present.
