sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
Hardness: 6.5-7 Mohs; Color: Opaque red (due to iron); Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Opaque red (due to iron)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Opaque red (due to iron); 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-rich fluids in volcanic or sedimentary environments, often associated with iron-rich mineral deposition. It can form over millions of years through hydrothermal processes.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and carvings. Also popular as a decorative stone and in metaphysical practices.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back to Arabic, Persian, Greek, and Latin. It is an opaque variety of chalcedony.
Field identification & locations
Identify by its waxy luster, smooth conchoidal fracture, and extreme hardness (it will scratch glass). Commonly found in river beds or desert environments in regions like India, Brazil, and the Southwestern US.
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