igneous
Quartz-rich granitic fragment
Likely granite or granitic pegmatite; chiefly quartz (SiO₂) with feldspar and possibly mica
AI-generated identification · may be incorrectSmall, irregular, pale gray-white fragment with a granular texture and sparkling translucent grains. Quartz hardness is 7 Mohs; feldspar is about 6, with vitreous to dull luster and no obvious cleavage in quartz; exact properties are uncertain from the image.
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Physical properties
Small, irregular, pale gray-white fragment with a granular texture and sparkling translucent grains. Quartz hardness is 7 Mohs; feldspar is about 6, with vitreous to dull luster and no obvious cleavage in quartz; exact properties are uncertain from the image.
Formation & geological history
Likely crystallized slowly from silica-rich magma, producing interlocking quartz and feldspar crystals; such rocks commonly formed in Precambrian to younger continental crust. A hand specimen cannot establish its geological age or precise rock name.
Uses & applications
Common granite is used as crushed aggregate, building stone, countertops, and monuments; attractive quartz-rich pieces may be collected but this fragment has little commercial value.
Geological facts
The contrasting white and gray grains are consistent with quartz-feldspar intergrowth, though weathered quartzite or another felsic rock is also possible.
Field identification & locations
Look for visible interlocking grains, abundant glassy quartz, blocky feldspar cleavage, and occasional dark mica. A fresh broken surface, hardness testing, streak, and ideally a thin section or chemical analysis are needed for confident identification; common worldwide in continental shields and granite provinces.
