sedimentary
Red Jasper
Microcrystalline Quartz (SiO2) with iron oxide inclusions
Hardness: 6.5-7 on the Mohs scale, Color: Red to reddish-brown, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), 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, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific gravity: 2.58-2.91
Formation & geological history
Forms through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often associated with iron-rich deposits over millions of years.
Uses & applications
Widely used in tumbled stones, cabochons, carving, decorative objects, and jewelry making.
Geological facts
Red jasper has been used since ancient times for amulets, seals, and weaponry. Its distinctive red color is caused by iron oxide impurities within the quartz matrix.
Field identification & locations
Can be identified by its opaque red color, microcrystalline structure, conchoidal fracture, and hardness that scratches glass. Found worldwide, particularly in India, Brazil, Russia, and the USA.
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