sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
AI-generated identification · may be incorrectHardness: 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
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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.
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