mineral

Polished brown jasper (likely iron-rich jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂)

AI-generated identification · may be incorrect

Typically Mohs 6.5–7; opaque reddish- to dark-brown with a vitreous-to-waxy polish and no visible crystal faces. The fine-grained quartz has no cleavage and commonly shows iron-oxide streaks or patches.

Identified October 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids fill cavities or replace sediment, with iron oxides producing the brown color; deposits occur in many geological ages and settings.

Uses & applications

Used for cabochons, beads, ornaments, and lapidary pieces; jasper is also collected as a decorative stone.

Geological facts

Jasper is a variety of chalcedony, made of microscopic quartz crystals; color and pattern vary widely with impurities.

Field identification & locations

The image shows a small polished, opaque brown stone with subtle banding, consistent with jasper, though a photograph cannot confirm the identification. Look for its hardness, opaque appearance, and lack of cleavage; common sources include India, Brazil, Australia, and the United States.