sedimentary
Jasper
Silicon Dioxide (SiO₂)
Hardness: 6.5-7 (Mohs); Color: Deep burgundy, reddish-brown, or black; Luster: Dull to vitreous; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep burgundy, reddish-brown, or black
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep burgundy, reddish-brown, or black; Luster: Dull to vitreous; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica-rich water in cavities or sedimentary layers. Its color comes from iron impurities. These specimens often originate from eroded bedrock transported by rivers or coastal tides.
Uses & applications
Used primarily in lapidary arts, jewelry making (cabochons), energy healing practices, and as a decorative stone in landscaping.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek 'iaspis', meaning 'spotted stone.' It has been used for seals and amulets since ancient Mesopotamian times.
Field identification & locations
Look for a smooth, waxy texture when wet and a conchoidal fracture (curved breaks). It is commonly found on beaches or in stream beds in volcanic or sedimentary regions. Unlike glass, it will not have air bubbles.
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