mineral
Tumbled jasper
Microcrystalline quartz (SiO₂), commonly iron-stained chalcedony/jasper
AI-generated identification · may be incorrectOpaque, polished brown-gold, black, and cream mottling with a vitreous-to-waxy luster; quartz hardness is about 6.5–7 Mohs, with no cleavage and conchoidal fracture. Specific gravity is approximately 2.6.
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Physical properties
Opaque, polished brown-gold, black, and cream mottling with a vitreous-to-waxy luster; quartz hardness is about 6.5–7 Mohs, with no cleavage and conchoidal fracture. Specific gravity is approximately 2.6.
Formation & geological history
Forms when silica-rich fluids fill cavities or replace volcanic and sedimentary material, with iron and other impurities producing the colors; specimens may be millions to hundreds of millions of years old depending on the deposit.
Uses & applications
Used for cabochons, beads, carvings, worry stones, and ornamental objects; attractive polished pieces are inexpensive collectible gemstones.
Geological facts
The pattern is characteristic of jasper or jasper-rich chalcedony, not a single precise variety identifiable from the image alone.
Field identification & locations
Identify by its opacity, earthy brecciated or orbicular pattern, glassy polish, and resistance to scratching by steel; common sources include India, Madagascar, Brazil, Australia, and the western United States.
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