mineral
Tumbled brown jasper
Microcrystalline quartz (SiO₂), commonly called jasper
AI-generated identification · may be incorrectOpaque, smooth, brown chalcedony with a vitreous-to-waxy polish; Mohs hardness 6.5–7, trigonal quartz structure, no visible cleavage. The exact variety cannot be confirmed from the image alone.
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Physical properties
Opaque, smooth, brown chalcedony with a vitreous-to-waxy polish; Mohs hardness 6.5–7, trigonal quartz structure, no visible cleavage. The exact variety cannot be confirmed from the image alone.
Formation & geological history
Silica-rich fluids filled cavities or replaced material in rock, then hardened; jasper deposits formed in many geological periods and settings.
Uses & applications
Used for beads, small carvings, jewelry, and decorative objects; this specimen has been tumbled and polished.
Geological facts
Jasper is an opaque variety of chalcedony, colored by mineral impurities such as iron oxides.
Field identification & locations
Look for a dense, opaque stone with a smooth, waxy fracture and hardness sufficient to scratch glass; common worldwide. The photo shows a small polished pebble, not enough to verify its exact identification.
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