mineral
Tumbled jasper (likely)
Jasper, an opaque microcrystalline variety of quartz (SiO₂)
AI-generated identification · may be incorrectOpaque, earthy red, tan, and green-brown mottling with a polished surface; quartz hardness is 7 Mohs, vitreous to dull luster, trigonal crystal structure, and no cleavage. The exact variety cannot be confirmed from the photo alone.
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Physical properties
Opaque, earthy red, tan, and green-brown mottling with a polished surface; quartz hardness is 7 Mohs, vitreous to dull luster, trigonal crystal structure, and no cleavage. The exact variety cannot be confirmed from the photo alone.
Formation & geological history
Forms as silica-rich fluids fill cavities or replace material in rock, with iron and other impurities producing its colors; jasper deposits span many geological ages and settings.
Uses & applications
Used for beads, cabochons, carvings, and decorative objects; this small tumbled piece is primarily collectible.
Geological facts
Jasper’s color patterns result from mineral impurities and inclusions; “jasper” describes a broad range of opaque silica-rich material.
Field identification & locations
Look for opacity, mottled colors, and a glassy-to-waxy polish; common sources include India, Brazil, Madagascar, and the western United States. A hardness or streak test can help distinguish it from softer imitations.
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Mineral