mineral
Tumbled brown stone, possibly jasper or iron-rich quartz
Uncertain; likely microcrystalline quartz (SiO₂) with iron-oxide inclusions
AI-generated identification · may be incorrectOpaque to weakly translucent brown, with a dull to slightly waxy luster and irregular mottling; likely hardness about 6.5–7 Mohs, lacking visible cleavage. The small rounded shape indicates tumbling or natural abrasion.
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Physical properties
Opaque to weakly translucent brown, with a dull to slightly waxy luster and irregular mottling; likely hardness about 6.5–7 Mohs, lacking visible cleavage. The small rounded shape indicates tumbling or natural abrasion.
Formation & geological history
If jasper, it formed when silica-rich fluids replaced or cemented volcanic or sedimentary material, with iron oxides producing the brown color; its exact geological age and locality cannot be determined from the image.
Uses & applications
Used as a decorative stone, cabochon, bead, or inexpensive lapidary material; it has little industrial value in this small form.
Geological facts
The appearance is consistent with common brown jasper, iron-stained chalcedony, or another quartz-rich pebble, but a firm identification requires a sharper image and tests such as streak, hardness, and specific gravity.
Field identification & locations
Commonly found in river gravels and volcanic or sedimentary terrains worldwide. A quartz-rich specimen resists scratching by a steel knife, while jasper leaves a white streak and shows no fizz with dilute acid.
