sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Hardness: 6.5–7 on the Mohs scale. Color: Opaque yellow, mustard, or gold. Luster: Vitreous to waxy. Crystal Structure: Trigonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.58–2.91.

Hardness: 6
Color: Opaque yellow, mustard, or gold
Luster: Vitreous to waxy

Identified March 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water or within volcanic ash when silica replaces other materials. Its yellow color comes from high concentrations of goethite or iron oxide (limonite) inclusions incorporated during the solidification process.

Uses & applications

Primarily used in jewelry for cabochons and beads, as an ornamental stone for carvings, and in lapidary arts. Historically used for making tools due to its sharp conchoidal fracture.

Geological facts

Jasper is often found in large massive deposits. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone.' Yellow Jasper is specifically associated with solar energy in various cultural traditions.

Field identification & locations

Identify in the field by its opaque nature (even on thin edges), smooth conchoidal fracture, and inability to be scratched by a steel knife. Common locations include India, Russia, Brazil, France, and the USA (California and Oregon).

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