sedimentary
Fancy Jasper
Jasper (Cryptocrystalline Quartz, SiO2)
Hardness: 6.5-7.0 (Mohs); Color: Multicolored (green, red, cream, lilac); Luster: Vitreous to waxy; Texture: Fine-grained, opaque; Fracture: Conchoidal
- Hardness
- 6
- Color
- Multicolored (green, red, cream, lilac)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7.0 (Mohs); Color: Multicolored (green, red, cream, lilac); Luster: Vitreous to waxy; Texture: Fine-grained, opaque; Fracture: Conchoidal
Formation & geological history
Formed from the deposition of silica from water in sedimentary environments, often replacing organic materials or filling cavities. The distinct colors are caused by iron oxides and other mineral impurities.
Uses & applications
Used primarily for lapidary work, including cabochons, beads, ornamental carvings, and 'worry stones' because of its high polish and durability.
Geological facts
Jasper has been used as a gemstone since antiquity and is mentioned in many ancient texts. The name 'Fancy Jasper' specifically refers to specimens with a mottled mix of multiple colors across the surface.
Field identification & locations
Identify by its hardness (it cannot be scratched by a steel knife), smooth texture, and colorful patches. Commonly found in major deposits in India and South Africa.
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