sedimentary
Red Jasper
Silicon dioxide (Microcrystalline Quartz, $SiO_2$)
Hardness: 6.5-7 on the Mohs scale, Color: Red to reddish-brown due to iron oxide impurities, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (exhibits 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 oxide impurities, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (exhibits conchoidal fracture), Specific gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of silica-rich sediments or volcanic ash, often in marine environments, where iron oxides precipitate within the silica matrix over millions of years.
Uses & applications
Commonly used in ornamental carvings, cabochons, polished stones, beads, and metaphysical practices.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry by civilizations such as the ancient Egyptians, Greeks, and Native Americans.
Field identification & locations
Identified by its opaque red color, conchoidal fracture, and lack of visible crystal grains. Found worldwide, particularly in India, Brazil, Russia, and the western United States.
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