sedimentary

Jasper

Silicon dioxide (SiO2)

Hardness: 6.5 - 7 (Mohs); Color: Brown/Yellow-brown; Luster: Dull/Waxy; Crystal Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58 - 2.91

Hardness: 6
Color: Brown/Yellow-brown
Luster: Dull/Waxy

Identified April 15, 2026More sedimentary →

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); Color: Brown/Yellow-brown; Luster: Dull/Waxy; Crystal Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58 - 2.91

Formation & geological history

Formed from silica-rich sediment deposits and groundwater infiltration in volcanic or sedimentary environments. Most specimens are millions of years old, often found in association with ancient volcanic activity.

Uses & applications

Commonly used for lapidary work, jewelry (beads/cabochons), or as a collector's stone. In history, it was used for making tools and seals.

Geological facts

Jasper is an opaque variety of chalcedony. Its color comes from mineral impurities like iron oxides; while red is famous, 'Yellow Jasper' or 'Brown Jasper' like this specimen is very common.

Field identification & locations

Identify by its opacity (does not transmit light), smooth waxy feel, and conchoid fracture (breaks like glass). Commonly found in riverbeds, deserts, and volcanic regions.