sedimentary
Jasper with Quartz Vein
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 Mohs; Color: Reddish-brown, dark green, and white; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Specific Gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Reddish-brown, dark green, and white
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: Reddish-brown, dark green, and white; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Specific Gravity: 2.6-2.9.
Formation & geological history
Formed from the deposition of silica in mineral-rich water, typically in volcanic or sedimentary environments. The white veins represent secondary mineralization where quartz filled into fractures.
Uses & applications
Used for lapidary work, jewelry, stone carvings, ornaments, and as a popular specimen for collectors.
Geological facts
Jasper is an opaque variety of chalcedony. The red coloration is usually caused by iron inclusions. It has been used for millennia to create seals and amulets.
Field identification & locations
Identify by its waxy-to-dull luster, opacity even at thin edges, and its hardness (it will scratch glass). Often found in riverbeds or coastal areas as water-worn cobbles.
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