igneous
Weathered quartz-rich rock, possibly quartzite or granite fragment
Uncertain; likely quartz–feldspar aggregate, possibly altered granite or quartzite
AI-generated identification · may be incorrectBrown-gray, coarse-grained and dull to faintly vitreous, with translucent quartz-like areas and dark inclusions; estimated Mohs hardness 6–7, with no obvious cleavage. The rounded, pitted surface suggests weathering or abrasion.
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Physical properties
Brown-gray, coarse-grained and dull to faintly vitreous, with translucent quartz-like areas and dark inclusions; estimated Mohs hardness 6–7, with no obvious cleavage. The rounded, pitted surface suggests weathering or abrasion.
Formation & geological history
Likely a natural fragment formed by crystallization of silica- and feldspar-rich magma or metamorphic recrystallization, then weathered and transported; its geological age cannot be determined from the image.
Uses & applications
Unexceptional pieces have little commercial value; comparable rock is used as aggregate, road stone, building stone, or landscaping material, while attractive quartzite may be collected or polished.
Geological facts
The photograph does not show diagnostic crystals or layering, so precise identification is not reliable without a fresh surface, hardness test, streak, and possibly acid or mineral analysis.
Field identification & locations
Commonly found in weathered granite terrains, river gravels, glacial deposits, and quartzite outcrops. Look for glassy quartz, feldspar cleavage, and whether grains fracture together; a steel file should barely scratch quartz-rich surfaces.
