mineral
Tumbled jasper (likely brecciated or leopardskin jasper)
Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions
AI-generated identification · may be incorrectOpaque, polished, burgundy-brown with cream patches and veins; waxy to vitreous luster; hardness about 6.5–7 Mohs; no visible cleavage; cryptocrystalline quartz structure; specific gravity about 2.55–2.70.
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Physical properties
Opaque, polished, burgundy-brown with cream patches and veins; waxy to vitreous luster; hardness about 6.5–7 Mohs; no visible cleavage; cryptocrystalline quartz structure; specific gravity about 2.55–2.70.
Formation & geological history
Jasper forms when silica-rich groundwater replaces or fills volcanic sediments and cavities, incorporating iron oxides and other minerals that create the mottled colors. Formation ages vary widely, commonly from Paleozoic to Cenozoic volcanic or sedimentary environments.
Uses & applications
Used for cabochons, beads, carvings, polished stones, and ornamental objects; occasionally used as a decorative aggregate. This small tumbled piece has modest lapidary value.
Geological facts
Jasper is a variety of opaque chalcedony, often grouped commercially by pattern rather than strict geological locality. Brecciation or iron staining can produce the cream-and-maroon appearance visible here.
Field identification & locations
Identify by its opacity, fine-grained texture, colorful irregular pattern, and inability to scratch with a steel knife; quartz or glass can scratch it. Common sources include India, Madagascar, Brazil, Mexico, and the western United States.
