sedimentary

Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Brown, tan, and reddish-pink patterns; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brown, tan, and reddish-pink patterns
Luster: Waxy to vitreous

Identified July 8, 2026More sedimentary →

Explore 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: Brown, tan, and reddish-pink patterns; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the deposition of silica from water-rich environments, often in hydrothermal veins or sedimentary deposits where silica replaces organic material or volcanic ash. This specimen has been tumbled and polished.

Uses & applications

Commonly used in lapidary work, jewelry making (cabochons and beads), ornamental stones, and as a pocket stone for collectors.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone. It is often multi-colored due to mineral impurities like iron oxides.

Field identification & locations

Look for its high hardness (it cannot be scratched by a steel knife) and its smooth, waxy luster when polished. It often features distinct color banding or mottled 'cloudy' patterns and displays a conchoidal fracture.