sedimentary

Yellow Jasper

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7.0 (Mohs scale); Color: Yellow to mustard-gold; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific gravity: 2.6-2.9.

Hardness: 6
Color: Yellow to mustard-gold
Luster: Vitreous to dull

Identified May 18, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7.0 (Mohs scale); Color: Yellow to mustard-gold; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific gravity: 2.6-2.9.

Formation & geological history

Formed through the deposition of silica from water or volcanic ash, typically in sedimentary environments where iron oxides provide the yellow coloration. Most jasper deposits are millions of years old.

Uses & applications

Used primarily in lapidary arts, jewelry (cabochons), interior decoration, and as a collector's stone or metaphysical pocket stone.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. It was highly prized in the ancient world for its supposed protective powers.

Field identification & locations

Identify in the field by its opacity, smooth water-worn surface (if found in rivers), and its ability to scratch glass. Commonly found in riverbeds, or areas with volcanic sedimentary history like the USA, Brazil, and India.