mineral

Tumbled yellow-brown jasper

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

AI-generated identification · may be incorrect

Opaque mustard-yellow to brown, waxy to dull luster, fine-grained and typically massive; Mohs hardness about 6.5–7, with no visible cleavage and conchoidal fracture. The rounded form indicates tumbling or water wear.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement sediments, incorporating iron oxides that produce the yellow-brown color; deposits range from Precambrian to younger geological ages. Common sources include volcanic and sedimentary terrains worldwide.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, decorative objects, and lapidary practice; occasionally used as an ornamental stone in construction.

Geological facts

Jasper is a variety of chalcedony or microcrystalline quartz, though many specimens contain impurities and mixed silica phases. Its color may resemble yellow jasper, mookaite, or iron-rich chert.

Field identification & locations

Identify by its opaque fine texture, quartz-like hardness, lack of cleavage, and resistance to scratching by steel; it should not fizz in dilute acid. Common locations include Australia, Brazil, India, Madagascar, South Africa, and the western United States.