igneous
Weathered quartz-rich rock fragment
Likely granitic or pegmatitic fragment; chiefly quartz (SiO₂) with feldspar and iron-oxide staining
AI-generated identification · may be incorrectPale cream to tan, granular texture, dull to weakly vitreous luster, and irregular fracture; individual grains appear around Mohs 6–7 (quartz) and 6–6.5 (feldspar). Crystal structure is interlocking rather than layered, with no obvious cleavage on the fragment.
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Physical properties
Pale cream to tan, granular texture, dull to weakly vitreous luster, and irregular fracture; individual grains appear around Mohs 6–7 (quartz) and 6–6.5 (feldspar). Crystal structure is interlocking rather than layered, with no obvious cleavage on the fragment.
Formation & geological history
Probably crystallized slowly from silica-rich magma, forming a coarse-grained igneous rock; its exact geological age and locality cannot be determined from the photograph. Brown coloration likely reflects surface weathering and iron oxides.
Uses & applications
Common granitic material is used for aggregate, dimension stone, and monuments; small unattractive fragments generally have negligible commercial or jewelry value.
Geological facts
The image is insufficient for a definitive species-level identification; it could also be a weathered quartz-feldspar vein fragment or pegmatite.
Field identification & locations
Look for visible quartz, feldspar, and mica grains, a light color, and a hard surface that scratches glass. A hand lens, streak test, hardness test, and fresh broken surface would improve identification; granitic rocks occur worldwide.
