mineral
Tumbled stones, likely jasper or agate
Likely microcrystalline quartz (SiO₂), varieties such as jasper or agate; exact identification is not possible from the image
AI-generated identification · may be incorrectSmall, wet, polished opaque yellow, red-brown, and green pebbles with a waxy-to-glassy luster. Quartz varieties have Mohs hardness 6.5–7, trigonal crystal structure, and no cleavage; specific gravity is about 2.6.
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Physical properties
Small, wet, polished opaque yellow, red-brown, and green pebbles with a waxy-to-glassy luster. Quartz varieties have Mohs hardness 6.5–7, trigonal crystal structure, and no cleavage; specific gravity is about 2.6.
Formation & geological history
If jasper or agate, these formed as silica-filled cavities or veins in rock, often in volcanic settings; their geological ages vary widely. The rounded surfaces are produced by tumbling.
Uses & applications
Used for lapidary crafts, jewelry, and decoration; common tumbled stones have modest collector value.
Geological facts
Tumbling smooths natural fractures and edges without changing the stones’ basic mineral composition.
Field identification & locations
Look for hardness, conchoidal fracture, and, in agate, translucent bands; color alone cannot identify these pieces, and green may be dyed. Similar material occurs worldwide, including Brazil, India, and the United States.
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