sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7.0 (Mohs scale), Color: Rusty red to brownish-red, Luster: Dull to vitreous, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7.0 (Mohs scale), Color: Rusty red to brownish-red, Luster: Dull to vitreous, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
Formation & geological history
Jasper is an opaque variety of chalcedony formed through the deposition of silica in hydrothermal veins or sedimentary environments. Its red color is derived from high concentrations of iron oxide (hematite) during formation.
Uses & applications
Mainly used as a semi-precious gemstone in jewelry, lapidary arts (tumbled stones, cabochons, carvings), and as decorative architectural stone.
Geological facts
Red jasper has been used since antiquity; it was known as the 'rain bringer' in some indigenous cultures and was frequently used in the ancient world for seals and amulets.
Field identification & locations
Identified in the field by its distinct opaque red color, smoothness when wet, and extreme hardness (it will scratch glass). Commonly found in riverbeds, deserts, and volcanic regions worldwide, notably in India, Brazil, and the USA.
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