mineral

Tumbled yellow jasper

Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, opaque yellow-orange, earthy to waxy luster, and no visible crystals or cleavage; specific gravity about 2.6. The rounded shape indicates tumbling or natural water-wear.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement fine-grained sediments, often with iron-oxide staining; deposits range from Precambrian to much younger ages. Common sources include volcanic and sedimentary terrains worldwide.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and lapidary collections; its toughness makes it suitable for polishing rather than high-end faceting.

Geological facts

Yellow coloration generally reflects goethite or limonite inclusions. Jasper is technically an opaque variety of chalcedony or microcrystalline quartz, although trade names often cover several similar rocks.

Field identification & locations

Identify it by its opaque, uniform fine texture, strong polish, and resistance to scratching with steel; quartz crystal, agate banding, or translucent edges would suggest a related material. Common locations include Brazil, India, Madagascar, Indonesia, and the United States.