mineral

Polished jasper

Jasper (microcrystalline quartz, SiO₂), likely brecciated or scenic jasper

AI-generated identification · may be incorrect

Opaque, fine-grained chalcedony/quartz with reddish-brown, mustard-yellow, and cream banding or brecciation; typically vitreous to dull luster, no visible cleavage, Mohs hardness about 6.5–7, and specific gravity around 2.5–2.7.

Identified August 28, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater replaces or fills cavities and fractures in volcanic or sedimentary rocks, with iron oxides producing the red and yellow colors. Jasper deposits are widespread and range from Precambrian to Cenozoic in age.

Uses & applications

Used as ornamental stone, cabochons, beads, carvings, bookends, and polished decorative specimens; too opaque for conventional faceted gemstones.

Geological facts

The specimen’s contrasting earthy swirls and bands are characteristic of scenic or brecciated jasper, though exact varieties cannot be confirmed from a photograph alone.

Field identification & locations

Identify it by its opaque, waxy-to-glassy surface, colorful patterns, and inability to scratch with a steel knife if well silicified; common sources include India, Madagascar, Brazil, Mexico, Australia, and the western United States.