sedimentary

Jasper (likely Polychrome or Ocean Jasper)

Silicon Dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5–7 (Mohs scale), Color: Multi-colored swirling (pink, grey, cream, green), Luster: Vitreous to dull, Crystal Structure: Microcrystalline/Trigonal, Specific Gravity: 2.58–2.91

Hardness: 6

Identified March 14, 2026More sedimentary →

Explore Jasper (likely Polychrome or Ocean Jasper) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6.5–7 (Mohs scale), Color: Multi-colored swirling (pink, grey, cream, green), Luster: Vitreous to dull, Crystal Structure: Microcrystalline/Trigonal, Specific Gravity: 2.58–2.91

Formation & geological history

Formed through the deposition of silica from volcanic ash or water-saturated environments during the sedimentation process; typically found in Cretaceous to Jurassic volcanic formations.

Uses & applications

Primarily used in jewelry (beads, cabochons), ornamental carvings, and by mineral collectors for its unique aesthetic patterns.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Polychrome' refers to the multiple colors formed by iron oxides and other mineral inclusions that create 'landscape-like' patterns.

Field identification & locations

Identify in the field by its opacity (it does not let light through even when thin), smooth conchoidal fracture, and inability to be scratched by a steel knife. Common in Madagascar, USA, and Brazil.