mineral

Tumbled yellow jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque mustard-yellow to brown, smooth water-worn/tumbled surface, dull to silky luster, cryptocrystalline quartz; Mohs hardness about 6.5–7, no visible cleavage, specific gravity roughly 2.5–2.7.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement or replace sediment and volcanic material, with iron oxides producing the yellow coloration; commonly Precambrian to younger, but the specimen’s age cannot be determined from the image.

Uses & applications

Used as an ornamental stone, cabochons, beads, carvings, and lapidary material; attractive polished pieces are collected but generally inexpensive.

Geological facts

Jasper is an opaque variety of chalcedony or microcrystalline quartz, and its colors commonly reflect hematite or goethite impurities.

Field identification & locations

Identify it by its opacity, fine-grained texture, waxy-to-dull luster, lack of cleavage, and hardness sufficient to scratch ordinary glass. Yellow jasper occurs worldwide, including India, Madagascar, Brazil, Australia, and the western United States; this appears naturally water-worn or tumbled.