gemstone

Polished brown stone, possibly jasper

Likely iron-rich microcrystalline quartz (SiO₂); exact identification is uncertain from the image

AI-generated identification · may be incorrect

Dark brown with mottled reddish-gold patches and a glossy, rounded surface. If jasper, hardness is about 6.5–7 Mohs, luster is vitreous to waxy, and its quartz crystals are too fine to see; no obvious cleavage.

Identified September 24, 2026More gemstone →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill or replace rock, often coloring it with iron oxides. Deposits occur in rocks of many ages; the specimen appears polished, obscuring diagnostic texture.

Uses & applications

Polished stones are used for jewelry, cabochons, carvings, and collecting; jasper is also used decoratively.

Geological facts

Jasper is an opaque variety of chalcedony, but brown polished stones can resemble other materials; appearance alone cannot confirm the identification.

Field identification & locations

Check for a glassy-to-waxy polish, opaque body, and hardness near 7; a scratch or mineral test can help distinguish quartz-rich jasper from softer lookalikes. Jasper is found worldwide, including India, Australia, Brazil, and the western United States.