sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs scale), Color: Brown/Yellow/Black patterns, Luster: Vitreous to dull, Crystal Structure: Microcrystalline (Trigonal), Cleavage: None, Fracture: Conchoidal
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brown/Yellow/Black patterns, Luster: Vitreous to dull, Crystal Structure: Microcrystalline (Trigonal), Cleavage: None, Fracture: Conchoidal
Formation & geological history
Formed through the accumulation of fine volcanic ash or silica-rich sediments in hydrothermal or sedimentary environments, often solidified through chemical precipitation.
Uses & applications
Used primarily in lapidary arts, jewelry (cabochons), interior decoration, and as a popular collector's stone due to unique patterns.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. No two pieces are ever truly identical due to the complex impurity layering.
Field identification & locations
Identify in the field by its hardness (will scratch glass), opacity, and smooth, waxy surface when polished or wet. Common in riverbeds and mountainous regions globally.
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