sedimentary
Red Jasper
Quartz (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Red to brownish-red with yellowish patches, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Fracture: Conchoidal, Specific Gravity: 2.58–2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Red to brownish-red with yellowish patches, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Fracture: Conchoidal, Specific Gravity: 2.58–2.91
Formation & geological history
Formed primarily as a result of the deposition of silica from volcanic fluids or in sedimentary environments where hydrothermal activity replaces organic matter or other minerals with silica. Its red color is derived from iron impurities.
Uses & applications
Commonly used as a gemstone for jewelry (cabochons, beads), decorative ornaments, metaphysical healing stones, and historically for tools and seals.
Geological facts
Jasper is an opaque variety of chalcedony. It has been used since antiquity, notably appearing in the breastplate of the High Priest in Biblical descriptions and as a favorite gemstone in the ancient world.
Field identification & locations
Identified in the field by its opacity (even on thin edges), its hardness (will scratch glass), and its smooth, waxy fracture surface. It is commonly found globally, with significant deposits in India, Brazil, and the USA.
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