sedimentary

Jasper (Tumbled)

Silicon Dioxide (SiO₂)

Hardness: 6.5–7 (Mohs); Color: Multi-colored (brown, tan, dark purple/grey patches); Luster: Vitreous to waxy; Crystal structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91

Hardness: 6
Color: Multi-colored (brown, tan, dark purple/grey patches)
Luster: Vitreous to waxy

Identified March 28, 2026More sedimentary →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Formed through the deposition of silica from water solutions or volcanic ash, often filling cavities in volcanic rocks or occurring as nodules in sedimentary layers. Its colors result from mineral impurities like iron oxides.

Uses & applications

Used primarily for lapidary arts, jewelry (cabochons, beads), decorative ornaments, and as a popular 'pocket stone' for collectors.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Old French word 'jaspre,' meaning 'spotted or speckled stone.' It has been used by ancient civilizations for seals, amulets, and architectural inlay for thousands of years.

Field identification & locations

Identify in the field by its opacity (even on thin edges), hardness (it will scratch glass), and smooth, waxy feel when water-worn. Common in riverbeds and coastal regions globally, especially in Oregon (USA), Brazil, and India.