mineral
Weathered quartz-rich pebble
Likely quartz-bearing vein rock; exact identification requires testing
AI-generated identification · may be incorrectSmall rounded, tan-gray specimen with dull to slightly waxy luster and irregular fracture; likely Mohs hardness about 6–7 if quartz-rich, with no obvious cleavage. The mottled surface suggests weathering and iron-oxide staining.
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Physical properties
Small rounded, tan-gray specimen with dull to slightly waxy luster and irregular fracture; likely Mohs hardness about 6–7 if quartz-rich, with no obvious cleavage. The mottled surface suggests weathering and iron-oxide staining.
Formation & geological history
Probably formed in a quartz vein or silica-rich host rock, then eroded and rounded by transport; its geological age cannot be determined from the photograph. Common alteration minerals may include clay and iron oxides.
Uses & applications
Primarily a curiosity or teaching/collection specimen; not gem-quality or economically valuable based on appearance.
Geological facts
The pale translucent patches may be quartz, while brown-red areas are likely limonite or hematite staining. A definitive identification would require hardness, streak, acid, and possibly microscopic testing.
Field identification & locations
Common in stream gravels and weathered quartz veins worldwide. Scratch glass if quartz-rich, inspect for conchoidal fracture, and test streak on unglazed porcelain; avoid assuming it is a gemstone from color alone.
