mineral
Tumbled red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored chiefly by iron oxides
AI-generated identification · may be incorrectOpaque reddish-brown stone with a polished, vitreous-to-waxy surface; quartz is Mohs 7, with no visible cleavage and a trigonal crystal structure at microscopic scale. The photograph alone cannot confirm the exact jasper variety.
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Physical properties
Opaque reddish-brown stone with a polished, vitreous-to-waxy surface; quartz is Mohs 7, with no visible cleavage and a trigonal crystal structure at microscopic scale. The photograph alone cannot confirm the exact jasper variety.
Formation & geological history
Jasper forms as silica-rich material that fills cavities or replaces sediment, with iron oxides producing red coloration; deposits occur in rocks of many geological ages.
Uses & applications
Used for beads, cabochons, carvings, and inexpensive decorative objects; also collected as a tumbled stone.
Geological facts
Jasper is defined by its opacity and often displays distinctive mottling or bands from mineral impurities.
Field identification & locations
Look for an opaque, hard stone with red coloration and varied patterns; jasper occurs worldwide, including India, Brazil, Australia, and the United States. A small tumbled piece like this commonly sells for about $1–$10.
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