sedimentary

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Yellow, mustard, ochre-gold; Luster: Dull to Vitreous/Waxy; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Yellow, mustard, ochre-gold
Luster: Dull to Vitreous/Waxy

Identified April 13, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Yellow, mustard, ochre-gold; Luster: Dull to Vitreous/Waxy; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the accumulation of silica-rich fluids that penetrate through volcanic cracks or sedimentary layers. The yellow color is caused by the inclusion of iron oxide minerals like goethite or limonite.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons and beads), decorative ornaments, and as a popular meditation or 'healing' stone in spiritual practices.

Geological facts

Jasper is an opaque variety of chalcedony. In ancient times, it was considered a stone of protection and was often referred to as the 'Rain Bringer' in Native American traditions.

Field identification & locations

Identify in the field by its opacity (unlike translucent agate) and smooth, conchoidal fracture. Often found in riverbeds or coastal gravels where harder minerals concentrate. Common in the Western USA, Brazil, and India.