sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5 - 7 on Mohs scale; Color: Red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58 - 2.91
- Hardness
- 6
- Color
- Red to brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5 - 7 on Mohs scale; Color: Red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58 - 2.91
Formation & geological history
Formed from the deposition of silica rich fluids in cracks or voids of other rocks, or from the consolidation of radiolarian ooze. The red color comes from iron oxide (hematite) impurities.
Uses & applications
Commonly used for lapidary work including cabochons, beads, and carvings. Historically used for seals and talismans. Occasionally used as industrial filler or in construction as decorative stone.
Geological facts
Jasper was a favorite gem in antiquity and is mentioned in the Bible as a stone on the high priest's breastplate. It is an opaque variety of chalcedony.
Field identification & locations
Identify by its opaque nature, red color, and lack of cleavage (conchoidal fracture). It is found worldwide in volcanic and sedimentary environments, notably in Brazil, India, and the USA.
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