igneous
Weathered igneous rock fragment, possibly granite or granitic gneiss
Indeterminate; likely quartz–feldspar–mica aggregate (granite), possibly foliated gneiss
AI-generated identification · may be incorrectCoarse-grained, mottled cream, gray, and brown surface with weakly visible mineral grains; likely Mohs hardness 6–7, vitreous to dull luster, negligible cleavage as a whole, and specific gravity about 2.6–2.8.
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Physical properties
Coarse-grained, mottled cream, gray, and brown surface with weakly visible mineral grains; likely Mohs hardness 6–7, vitreous to dull luster, negligible cleavage as a whole, and specific gravity about 2.6–2.8.
Formation & geological history
Likely formed by slow cooling of silica-rich magma deep underground; if gneissic, it was later metamorphosed under high heat and pressure. Exact age and provenance cannot be determined from the image.
Uses & applications
Common granite is used for dimension stone, countertops, monuments, aggregate, and building materials; small unattractive fragments generally have little commercial or jewelry value.
Geological facts
The apparent dark patches may be biotite or weathering staining, while pale areas are probably quartz and feldspar. Image quality prevents a confident species-level identification.
Field identification & locations
Look for visible interlocking quartz, feldspar, and dark mica grains; a glassy quartz grain scratches glass, whereas feldspar commonly shows cleavage. Common worldwide, especially in continental crust and granitic mountain belts.
