mineral

Tumbled reddish-brown stone, likely jasper

Jasper (microcrystalline quartz, SiO₂), possibly red jasper or jasper-rich chert

AI-generated identification · may be incorrect

Opaque burgundy-brown, smoothly tumbled, with a dull to waxy luster and no visible crystals. Hardness about 6.5–7 Mohs, massive microcrystalline structure, conchoidal fracture, and specific gravity around 2.6.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater replaces or fills pores in volcanic ash, sediment, or other rocks; its exact geological age cannot be determined from the photograph. Red coloration commonly comes from hematite or iron oxides.

Uses & applications

Used for beads, cabochons, carvings, polishing stones, and ornamental objects; generally inexpensive as a tumbled stone.

Geological facts

Jasper is a variety of chalcedony or microcrystalline quartz, though “jasper” is commonly used broadly for opaque silica-rich rocks. Color patterns vary greatly with iron and other mineral impurities.

Field identification & locations

Identify by its opaque red-brown color, glass-scratching hardness, smooth conchoidal chips, and lack of cleavage; common sources include India, Madagascar, Brazil, Uruguay, and the western United States.