sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Deep red/brick red; Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep red/brick red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep red/brick red; Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the accumulation of silica in volcanic or sedimentary environments, often associated with hydrothermal activity. Its red color is derived from iron impurities that oxidized during the silicification process.
Uses & applications
Used extensively in jewelry as beads and cabochons, as an ornamental stone in ornaments and mosaics, and highly valued in spiritual practices and crystal collecting.
Geological facts
Red Jasper has been used since antiquity; it was known as the 'rain-bringer' in some indigenous cultures and was frequently used in the ancient Mediterranean for seals and amulets.
Field identification & locations
Identify in the field by its opaque red color, wax-like luster when wet, and smooth conchoidal fracture. Commonly found in riverbeds, desert pavements, and regions with volcanic activity like Oregon, India, and Brazil.
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