mineral

Polished yellow jasper

Jasper, microcrystalline quartz (SiO₂), commonly containing iron oxides and other silicates

AI-generated identification · may be incorrect

Opaque mustard-yellow to brown-orange, vitreous to waxy luster, fine-grained cryptocrystalline structure, no visible cleavage; Mohs hardness 6.5–7, specific gravity about 2.5–2.7.

Identified August 26, 2026More mineral →

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Physical properties

Opaque mustard-yellow to brown-orange, vitreous to waxy luster, fine-grained cryptocrystalline structure, no visible cleavage; Mohs hardness 6.5–7, specific gravity about 2.5–2.7.

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or altered rock, with iron producing the yellow, brown, and red colors. Its age depends on the deposit, commonly Paleozoic to Cenozoic.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and lapidary specimens; occasionally used as decorative stone. Common polished pieces typically have modest commercial value.

Geological facts

Jasper is a variety of opaque chalcedony or microcrystalline quartz rather than a single mineral species. Color zoning and dark dendritic or iron-rich inclusions are common.

Field identification & locations

Identify it by its opacity, smooth waxy polish, mottled coloration, lack of cleavage, and ability to scratch glass; it is commonly found in volcanic and sedimentary terrains worldwide, including the western United States, Madagascar, Brazil, and Australia.