sedimentary
Jasper
Silicon dioxide (SiO2)
Hardness: 6.5-7 (Mohs); Color: tan to reddish-brown; Luster: vitreous to waxy; Crystal structure: Microcrystalline/Cryptocrystalline; Conchoidal fracture
- Hardness
- 6
- Color
- tan to reddish-brown
- Luster
- vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: tan to reddish-brown; Luster: vitreous to waxy; Crystal structure: Microcrystalline/Cryptocrystalline; Conchoidal fracture
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, typically undergoing intense consolidation over millions of years.
Uses & applications
Commonly used in lapidary work, jewelry (cabochons), as decorative stones, and in crystal healing practices.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone, referring to its multi-colored or mottled appearance.
Field identification & locations
Identify by its extreme hardness (cannot be scratched by a steel knife) and waxy feel when polished. Widely found in riverbeds and coastal regions globally.
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