mineral

Tumbled yellow jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂)

AI-generated identification · may be incorrect

Opaque mustard-yellow to ochre, smooth polished surface, vitreous to waxy luster; quartz hardness 6.5–7, trigonal crystal structure, no cleavage, specific gravity about 2.6. The image alone cannot confirm the exact stone; yellow chalcedony or another silica-rich material may look similar.

Identified October 13, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids deposit microscopic quartz in cavities or replace sediment; iron compounds commonly create yellow coloration. It can occur in rocks of many geological ages.

Uses & applications

Used for beads, cabochons, ornaments, and small polished collectibles; generally not used as structural stone.

Geological facts

Jasper is valued for its opaque color and patterns, unlike transparent varieties of quartz.

Field identification & locations

Look for a dense, opaque stone with a smooth polish and no visible grains; hardness testing or laboratory analysis helps distinguish it from softer lookalikes. Jasper occurs worldwide, including India, Brazil, and the United States.