mineral

Red jasper (likely tumbled/polished chalcedony)

Jasper, an opaque variety of microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

Opaque brick-red, rounded and polished, with a vitreous-to-waxy luster; quartz crystal structure, no visible cleavage, and Mohs hardness about 6.5–7. The photo alone cannot confirm the exact material; dyed stone or glass can resemble it.

Identified October 5, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids deposit and recrystallize, commonly incorporating iron oxides that produce red coloration. It occurs in varied ages and settings, including volcanic rocks and sedimentary formations.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; lesser-grade material is sometimes used as an ornamental stone.

Geological facts

Jasper is technically an opaque, impurity-rich form of chalcedony, rather than a single distinct mineral species.

Field identification & locations

Look for a uniformly opaque body, natural color variation, and hardness sufficient to resist scratching by a steel knife; glass may show bubbles or conchoidal fracture. Jasper occurs worldwide, including India, Brazil, Australia, and the western United States.