gemstone

Polished jasper (likely brecciated or picture jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides and other inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque red-orange and brown mottling with a smooth polish and waxy-to-vitreous luster. Its quartz crystals are microscopic, so crystal faces and cleavage are not visible; fracture is typically uneven to conchoidal.

Identified October 12, 2026More gemstone →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids or sediments are deposited and later silicified, often incorporating iron-rich material. It occurs in rocks of many geological ages, with its patterns shaped by local sedimentation, alteration, or brecciation.

Uses & applications

Used for cabochons, beads, carvings, and decorative objects; it is also collected as an inexpensive ornamental stone.

Geological facts

Jasper is a trade name for opaque, patterned chalcedony, and its colors and designs vary widely with impurities.

Field identification & locations

Look for opacity, fine-grained texture, and red or brown iron-oxide patterns; jasper occurs worldwide, including Brazil, India, Australia, and the western United States. A small polished cabochon like this commonly sells for about $2–$15, depending on pattern and workmanship.