mineral
Polished yellow jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide/clay impurities
AI-generated identification · may be incorrectTypically opaque yellow to cream with gray-brown veining, dull to waxy luster, and no visible crystals; Mohs hardness about 6.5–7, conchoidal fracture, and specific gravity around 2.6. The rounded shape indicates tumbling or natural water wear.
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Physical properties
Typically opaque yellow to cream with gray-brown veining, dull to waxy luster, and no visible crystals; Mohs hardness about 6.5–7, conchoidal fracture, and specific gravity around 2.6. The rounded shape indicates tumbling or natural water wear.
Formation & geological history
Forms when silica-rich fluids replace or cement sediment, with iron and other impurities producing yellow coloration; most deposits are Precambrian to younger. Common sources include India, Madagascar, Brazil, South Africa, and the western United States.
Uses & applications
Used for cabochons, beads, carvings, polished stones, and decorative objects; occasionally used as a minor ornamental aggregate. Common tumbled pieces have modest value.
Geological facts
The dark linear markings may be natural mineral veins or surface scratches/grooves; image-only identification cannot distinguish them reliably. Jasper is an opaque variety of chalcedony and microcrystalline quartz.
Field identification & locations
Identify by its opaque appearance, quartz-like hardness, waxy polish, and inability to scratch with a steel knife easily; a streak, hardness, and magnification test would help. Look for irregular color rather than uniform dyed coloration.
