igneous
Weathered quartz-rich rock, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, potentially granitic, or recrystallized quartzite
AI-generated identification · may be incorrectPale tan to gray-green, granular and dull-to-glassy; apparent hardness about 6–7 Mohs, with no obvious cleavage. The small specimen is heavily weathered, so crystal texture and composition are uncertain.
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Physical properties
Pale tan to gray-green, granular and dull-to-glassy; apparent hardness about 6–7 Mohs, with no obvious cleavage. The small specimen is heavily weathered, so crystal texture and composition are uncertain.
Formation & geological history
If granite, it crystallized slowly from silica-rich magma deep underground; if quartzite, it formed by metamorphism of sandstone. A precise geological age and classification require fresh surfaces or testing.
Uses & applications
Common equivalents are used as crushed stone, aggregate, building stone, and occasionally decorative material; this fragment has little practical or jewelry value.
Geological facts
The greenish tint may reflect chlorite, epidote, or weathering products rather than a distinct gemstone mineral.
Field identification & locations
Look for visible interlocking quartz and feldspar grains for granite, or a fused quartz texture that scratches glass for quartzite. Common worldwide; a streak, hardness test, acid test, and close examination of a freshly broken surface would improve identification.
