igneous
Granite-like felsic rock
Likely weathered granite or granitic gneiss; predominantly quartz, feldspar, and minor mica
AI-generated identification · may be incorrectLight gray, granular, and speckled with a dull to slightly sparkling luster; interlocking crystals are visible, with no obvious cleavage as a whole rock. Individual minerals are typically Mohs 6–7 (quartz) and 6 (feldspar); specific gravity about 2.6–2.7.
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Physical properties
Light gray, granular, and speckled with a dull to slightly sparkling luster; interlocking crystals are visible, with no obvious cleavage as a whole rock. Individual minerals are typically Mohs 6–7 (quartz) and 6 (feldspar); specific gravity about 2.6–2.7.
Formation & geological history
Formed by slow cooling of silica-rich magma deep underground, generally during Precambrian to Phanerozoic continental crust formation; surface weathering produced its rounded, pale appearance.
Uses & applications
Used as crushed aggregate, building stone, paving, and monuments; this small fragment has negligible commercial value.
Geological facts
The apparent glitter commonly comes from mica or reflective quartz grains. A definitive identification would require a closer view or tests such as hardness, streak, and acid reaction.
Field identification & locations
Common in continental terrains worldwide, especially exposed granite plutons and glacial or stream gravels. Look for visible quartz, white or pink feldspar, and black mica in a coarse interlocking texture; likely value is $0–$5 as an ordinary specimen.
