sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs scale); Color: Brownish-red to tan; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brownish-red to tan
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brownish-red to tan; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water-saturated environments or volcanic ash, occurring in sedimentary or metamorphic layers throughout various geological periods.
Uses & applications
Commonly used in jewelry as cabochons, for ornamental carving, and as decorative landscaping stones.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone.' Many Neolithic tools were made from this tough material.
Field identification & locations
Identified by its waxy luster and conchoidal fracture. Often found as rounded water-worn pebbles in stream beds and coastal areas. Collectors look for unique banding or patterns.
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