mineral
Tumbled jasper or chert pebble
Microcrystalline quartz, mainly SiO₂, likely jasper/chert
AI-generated identification · may be incorrectBrown-orange, opaque, dull to faintly waxy luster, smoothly waterworn or tumbled; Mohs hardness about 6.5–7, with no visible cleavage and conchoidal fracture expected. Exact identification is uncertain from the image alone.
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Physical properties
Brown-orange, opaque, dull to faintly waxy luster, smoothly waterworn or tumbled; Mohs hardness about 6.5–7, with no visible cleavage and conchoidal fracture expected. Exact identification is uncertain from the image alone.
Formation & geological history
Formed from silica-rich microcrystalline quartz, commonly replacing sediments or filling cavities in volcanic rocks; age depends on locality and may range from Paleozoic to recent. Its rounded shape likely reflects erosion or human tumbling.
Uses & applications
Used as a lapidary material for cabochons, carvings, beads, and decorative objects; not typically used in construction in specimen form.
Geological facts
Jasper is an opaque variety of chalcedony, while chert is a broader term for dense microcrystalline quartz. Iron oxides commonly produce the orange-brown coloration.
Field identification & locations
Look for a glassy or waxy surface, inability to scratch it with a steel knife, and a white streak; vinegar will not react. Common worldwide, especially in volcanic and sedimentary terrains.
