mineral

Yellow jasper (likely iron-stained chalcedony)

Microcrystalline quartz, SiO₂, commonly colored by iron oxides/hydroxides

AI-generated identification · may be incorrect

Opaque mustard-yellow, earthy to waxy luster, fine-grained and possibly tumbled or naturally rounded; quartz hardness is about 6.5–7 Mohs, with no visible cleavage and conchoidal fracture. Exact identification requires testing because the image cannot distinguish jasper from yellow chert or iron-rich stone.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or replaces sediments, while iron compounds create the yellow coloration; deposits range from ancient to geologically recent. Common in volcanic terrains, sedimentary chert beds, and weathered iron-rich zones.

Uses & applications

Used as a lapidary material for cabochons, carvings, beads, and polished specimens; not generally used as a construction aggregate. Common pieces are mainly of modest collecting value.

Geological facts

Jasper is an opaque variety of microcrystalline quartz, unlike translucent chalcedony. Yellow color typically reflects limonite or goethite staining rather than a distinct quartz variety.

Field identification & locations

Look for consistent fine texture, glassy/conchoidal fracture, lack of cleavage, and inability to scratch it with a steel knife; it should scratch window glass. Common worldwide, including India, Madagascar, Brazil, Australia, and the western United States.