sedimentary
Red Jasper
SiO2 (Microcrystalline Quartz)
Hardness: 6.5-7 on the Mohs scale, Color: Red to brownish-red with dark veins, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz), 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 brownish-red with dark veins, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz), Cleavage: None (conchoidal fracture), Specific gravity: 2.58-2.91
Formation & geological history
Formed from silica-rich sediments or volcanic ash that underwent diagenesis and low-grade metamorphism, often precipitated from hydrothermal solutions or silica-rich marine environments. Geological age varies widely depending on the deposit, ranging from Precambrian to Cenozoic.
Uses & applications
Used widely in ornamental carvings, cabochons for jewelry, tumbled stones, and collector specimens.
Geological facts
Red Jasper has been used since ancient times for amulets, seals, and weaponry. Its deep red color is primarily due to iron oxide inclusions.
Field identification & locations
Identified by its opaque red color, conchoidal fracture, and lack of cleavage. Common worldwide, especially in India, Brazil, Russia, and parts of the United States.
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