sedimentary
Red Jasper
Silicon dioxide (microcrystalline quartz), SiO2
AI-generated identification · may be incorrectHardness: 6.5 to 7 on the Mohs scale, Color: Red to reddish-brown due to iron impurities, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (exhibits conchoidal fracture), Specific gravity: 2.58 to 2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale, Color: Red to reddish-brown due to iron impurities, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (exhibits conchoidal fracture), Specific gravity: 2.58 to 2.91
Formation & geological history
Forms in sedimentary environments, often through the silification of clay-rich sediments or volcanic ash beds where iron oxide precipitates into chalcedony over millions of years.
Uses & applications
Used in lapidary arts, ornamental carvings, polished cabochons for jewelry, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The ancient Egyptians carved amulets from red jasper and associated it with the girdle of Isis.
Field identification & locations
Identified in the field by its opaque red color, waxy luster, and conchoidal fracture. Found worldwide, with notable deposits in India, Brazil, Russia, and the western United States.
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