sedimentary
Jasper (Green/Dragon Blood variety)
Silicon Dioxide (SiO2) with iron/clay inclusions
Hardness: 6.5-7 (Mohs scale); Color: Olive to deep green with possible red or yellow mottling; Luster: Vitreous to waxy; Structure: Microcrystalline; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Olive to deep green with possible red or yellow mottling
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Olive to deep green with possible red or yellow mottling; Luster: Vitreous to waxy; Structure: Microcrystalline; Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the precipitation of silica in volcanic or sedimentary environments, often associated with hydrothermal activity. Geological age varies greatly from Precambrian to Cenozoic.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons), ornamental carvings, 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 was highly prized in the ancient world for both its beauty and supposed protective properties.
Field identification & locations
Identify by its opacity (even when held to light), high hardness (will scratch glass), and smooth, waxy texture when wet or polished. Frequently found in riverbeds and coastal areas.
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