sedimentary

Jasper (Mookaite variety likely)

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Earthy reds, browns, tan, and cream; Luster: Dull to vitreous/waxy; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Earthy reds, browns, tan, and cream
Luster: Dull to vitreous/waxy

Identified March 22, 2026More sedimentary →

Explore Jasper (Mookaite variety likely) in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Jasper forms when silica-rich fluids permeate porous sediment or volcanic ash, slowly replacing organic or mineral matter with microcrystalline quartz. This specimen shows water-worn smoothing and iron-rich banding consistent with alluvial or stream-bed deposition.

Uses & applications

Used primarily in lapidary arts for cabochons, beads, and ornamental carvings. Due to its hardness, it is also popular as a tumbling stone for beginning collectors and in metaphysical jewelry.

Geological facts

Jasper has been used for millennia; the ancient Egyptians used it for talismans and amulets. It is an opaque variety of chalcedony, and its name is derived from the Greek 'iaspis', meaning spotted stone.

Field identification & locations

Identify in the field by its opacity (does not transmit light), conchoidal (shell-like) fracture patterns if chipped, and inability to be scratched by a steel knife. Frequently found in gravel beds, stream banks, and desert pavement across the globe, notably in Western Australia (Mookaite variety) and the Western US.