sedimentary
Fancy Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Multi-colored bands (yellow, red, brown); Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9
- Hardness
- 6
- Color
- Multi-colored bands (yellow, red, brown)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Multi-colored bands (yellow, red, brown); Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9
Formation & geological history
Formed through the infiltration of silica in sedimentary environments or volcanic ash beds. The iron impurities create the distinct red and yellow banding during mineralization.
Uses & applications
Used primarily for jewelry (cabochons and beads), ornamental carvings, tumbled stones, and as a collector's specimen.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone. It has been used for talismans and cylindrical seals since ancient Mesopotamia.
Field identification & locations
Identify by its waxy luster, smoothness, and opaque colors. Common in riverbeds and desert environments in areas like South Africa, Brazil, and India. It does not scratch with a pocketknife.
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