igneous
Feldspar-rich rock fragment
Likely weathered granite or granitic pegmatite; chiefly potassium feldspar and quartz, with possible mica
AI-generated identification · may be incorrectHardness about 6–7 Mohs; pale cream to tan, granular, with a dull to slightly vitreous luster. Irregular fracture and visible interlocking grains; exact composition cannot be confirmed from the image alone.
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Physical properties
Hardness about 6–7 Mohs; pale cream to tan, granular, with a dull to slightly vitreous luster. Irregular fracture and visible interlocking grains; exact composition cannot be confirmed from the image alone.
Formation & geological history
Formed by slow cooling of silica-rich magma, generally in Precambrian to younger continental crust. Weathering has produced the rough, stained exterior.
Uses & applications
Granite and feldspar are used as crushed aggregate, dimension stone, ceramics, and glass raw material; this small fragment has negligible commercial value.
Geological facts
The blocky pale grains are consistent with feldspar, while tiny darker specks may be biotite or iron-oxide staining. A fresh broken surface would provide a more reliable identification.
Field identification & locations
Common in continental uplands, granite outcrops, construction gravel, and glacial deposits. Look for visible quartz, feldspar cleavage faces, and occasional dark mica; a steel file should barely scratch it.
