mineral

Tumbled yellow jasper

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

AI-generated identification · may be incorrect

Typically opaque mustard-yellow to brown with a smooth polished surface, waxy to dull luster, hardness about 6.5–7 Mohs, no visible crystals, and conchoidal fracture; specific gravity ~2.6.

Identified August 15, 2026More mineral →

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Physical properties

Typically opaque mustard-yellow to brown with a smooth polished surface, waxy to dull luster, hardness about 6.5–7 Mohs, no visible crystals, and conchoidal fracture; specific gravity ~2.6.

Formation & geological history

Forms when silica-rich groundwater cements or replaces sedimentary and volcanic material, with iron oxides producing the yellow color. Jasper deposits range from Precambrian to Cenozoic ages.

Uses & applications

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

Geological facts

The rounded shape indicates human tumbling and polishing rather than natural weathering. Yellow jasper may overlap visually with iron-rich chalcedony, yellow quartzite, or dyed material.

Field identification & locations

Common in volcanic and sedimentary terrains worldwide, including Brazil, India, Madagascar, Australia, and the western United States. It can be identified by opacity, fine texture, lack of cleavage, and resistance to scratching by ordinary steel.