mineral
Red Jasper
Silicon Dioxide (Quartz variety), SiO2
Hardness: 6.5-7 on the Mohs scale, Color: Dark red to brownish-red due to iron oxide inclusions, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline quartz / chalcedony), 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: Dark red to brownish-red due to iron oxide inclusions, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline quartz / chalcedony), Cleavage: None (exhibits conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the hydrothermal deposition of silica-rich fluids or alteration of sedimentary deposits, often in ocean basins or volcanic environments. Geological age varies widely from Precambrian to Cenozoic.
Uses & applications
Widely used in jewelry, carved decorative objects, beads, tumbled stones, and occasionally as an ornamental building stone.
Geological facts
Red jasper has been used since ancient times for talismans, seals, and weaponry. Its deep red color comes from iron impurities trapped within the microcrystalline quartz matrix.
Field identification & locations
Can be identified by its opaque red color, waxy-to-vitreous luster, and hardness that easily scratches glass. Found worldwide, with major deposits in India, Brazil, Russia, Australia, and the USA.
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