sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs scale); Color: Deep reddish-brown with grey/black inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline quartz); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep reddish-brown with grey/black inclusions
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Deep reddish-brown with grey/black inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline quartz); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water or hydrothermal vents, with high concentrations of iron oxide (Hematite) providing the red color. Typically found in volcanic or sedimentary environments.
Uses & applications
Used primarily for ornamental purposes, jewelry (cabochons and beads), decorative stones, and by collectors for its polished aesthetic.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as the 'supreme nurturer.' Its red color is specifically due to the presence of iron impurities within the quartz matrix.
Field identification & locations
Identify by its waxy to dull luster, lack of transparency (even on thin edges), and its ability to scratch glass. Commonly found in riverbeds or within iron-rich rock formations.
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