sedimentary

Jasper

Silicon Dioxide (SiO2) with impurities

Hardness: 6.5-7 (Mohs scale); Color: Yellow, brown, tan, and cream with iron-rich staining; Luster: Dull to waxy; Structure: Microcrystalline; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Yellow, brown, tan, and cream with iron-rich staining
Luster: Dull to waxy

Identified July 4, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Yellow, brown, tan, and cream with iron-rich staining; Luster: Dull to waxy; Structure: Microcrystalline; Specific Gravity: 2.58-2.91

Formation & geological history

Formed by the deposition of silica from water solution in the pores and cavities of other rocks, or through the replacement of organic materials. The color is derived from high iron oxide content deposited during the sedimentary process.

Uses & applications

Used primarily as a gemstone for jewelry, lapidary arts, decorative carvings, and as a collector's item due to its unique patterns.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone.' It has been used for seals and amulets since ancient times.

Field identification & locations

Identified by its opacity, conchoidal fracture, and hardness (it cannot be scratched by a steel knife). Common in riverbeds and coastal regions; this specimen shows typical water-worn rounding.