sedimentary

Jasper

Silicon Dioxide (SiO2) with impurities

Hardness: 6.5-7 (Mohs scale); Color: Yellowish-brown/mustard; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91

Hardness: 6
Color: Yellowish-brown/mustard
Luster: Dull to waxy

Identified July 16, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Yellowish-brown/mustard; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91

Formation & geological history

Formed through the accumulation of fine volcanic ash or siliceous ooze that undergoes petrifaction or silicification, often associated with sedimentary geological processes.

Uses & applications

Commonly used for lapidary work, jewelry (beads and cabochons), ornamental stones, and as a popular specimen for beginner rock collectors.

Geological facts

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

Field identification & locations

Identify by its opacity (will not let light through even at thin edges) and его hardness; it cannot be scratched by a steel knife. Common in riverbeds and desert environments globally.