mineral
Tumbled red jasper (probable)
Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides
AI-generated identification · may be incorrectSmall rounded, polished pebble with reddish-brown color, opaque to slightly translucent edges, and dull-to-waxy luster. Hardness is about 6.5–7 Mohs; lacks visible cleavage and has a cryptocrystalline quartz structure; specific gravity is approximately 2.6.
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Physical properties
Small rounded, polished pebble with reddish-brown color, opaque to slightly translucent edges, and dull-to-waxy luster. Hardness is about 6.5–7 Mohs; lacks visible cleavage and has a cryptocrystalline quartz structure; specific gravity is approximately 2.6.
Formation & geological history
Forms when silica-rich fluids replace or fill cavities in volcanic and sedimentary rocks, with iron producing the red coloration. Its precise geological age cannot be determined from the photograph; tumbled examples are mechanically polished from natural material.
Uses & applications
Used for cabochons, beads, carvings, lapidary pieces, and inexpensive collectible specimens; it has little structural or industrial value.
Geological facts
Jasper is a variety of opaque chalcedony, though many commercial pieces are sold broadly as “red jasper.” Similar-looking red glass, dyed quartz, or carnelian can be distinguished by testing hardness and examining internal texture.
Field identification & locations
Common sources include India, Madagascar, Brazil, the United States, and Australia. Field identification relies on opaque iron-red coloration, fine grain, quartz-like hardness, and absence of bubbles or conchoidal glass texture.
