sedimentary
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
Hardness: 6.5-7 on the Mohs scale, Color: Red to reddish-brown due to iron inclusions, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 on the Mohs scale, Color: Red to reddish-brown due to iron inclusions, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Forms in sedimentary environments through the silica-rich precipitation in marine or lacustrine settings, often associated with volcanic activity or iron-rich hydrothermal fluids.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and as a collector's mineral specimen.
Geological facts
Red jasper has been used since ancient times for seals, signet rings, and talismans, and is frequently mentioned in ancient lapidary texts.
Field identification & locations
Easily identified by its opaque red color, waxy luster, and conchoidal fracture. Found worldwide, notably in India, Brazil, Russia, and the USA.
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