mineral

Brown tumbled stone, possibly jasper

Uncertain from the image; likely iron-rich microcrystalline quartz (SiO₂), commonly called jasper

AI-generated identification · may be incorrect

Opaque, smooth, brown stone with a waxy-to-glassy polish. If jasper, hardness is about 6.5–7 Mohs, specific gravity about 2.6, and its quartz crystals are too fine to see; the image does not reveal cleavage or confirm composition.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

A tumbled natural pebble or lapidary specimen; jasper forms when silica-rich fluids fill or replace rock, often colored by iron oxides. Its geological age and source cannot be determined visually.

Uses & applications

Decorative and collecting stone; jasper is also cut for beads, cabochons, and small carvings.

Geological facts

Jasper is an opaque variety of chalcedony, itself microcrystalline quartz; brown color often comes from iron-bearing impurities.

Field identification & locations

The rounded shape and polish indicate tumbling, but the photo is insufficient for a firm identification. Check for hardness and a consistent fine-grained texture; common jasper sources include Brazil, India, Madagascar, and the western United States.