metamorphic
Tumbled stone, likely ocean jasper or quartzite
Indeterminate from photograph; probable quartz-rich silicate rock, mainly SiO₂
AI-generated identification · may be incorrectSmall rounded, polished pebble with blue-gray and brown coloration, subdued vitreous luster, and no visible crystal faces or cleavage. Likely hardness about 6.5–7 Mohs; specific gravity roughly 2.6–2.7.
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Physical properties
Small rounded, polished pebble with blue-gray and brown coloration, subdued vitreous luster, and no visible crystal faces or cleavage. Likely hardness about 6.5–7 Mohs; specific gravity roughly 2.6–2.7.
Formation & geological history
Probably a naturally weathered and human-tumbled silicate pebble; if quartzite, it formed by metamorphism of quartz sandstone, commonly during Precambrian–Phanerozoic orogenies. Exact identification requires a close view, streak, hardness, and locality.
Uses & applications
Primarily a decorative, lapidary, or collectible tumbled stone; unsuitable for significant construction use at this size. Value is generally low unless attractive patterns or confirmed provenance are present.
Geological facts
The smooth shape and glossy surface indicate mechanical tumbling rather than a fresh natural fracture. Blue-gray coloration may also reflect sodalite, chalcedony, or altered feldspar, which cannot be distinguished reliably here.
Field identification & locations
Commonly found as beach, river, or commercial tumbler material worldwide; test with a steel file or quartz point, inspect translucency, and use a loupe for banding or grain. Avoid destructive testing if it may be valuable.
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