sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs scale), Color: Brick red to deep terracotta, Luster: Dull to waxy when raw, Crystal structure: Trigonal/Microcrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to deep terracotta, Luster: Dull to waxy when raw, Crystal structure: Trigonal/Microcrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
Formation & geological history
Formed from silica-rich groundwater percolating through sedimentary or volcanic rocks, where the presence of iron oxide (hematite) provides the red pigmentation. It can be found in various age deposits from Paleozoic to more recent strata.
Uses & applications
Commonly used as a gemstone for jewelry, in decorative carvings, cabochons, and as a collector's mineral. It is also used in construction as an ornamental stone in polished tiles.
Geological facts
Red jasper has been used since ancient times in various cultures; in Ancient Egypt, it was often associated with the 'blood of Isis' and used for amulets and scarabs.
Field identification & locations
Identify by its opaque red color, smoothness after fracture, and inability to be scratched by a steel blade. Found worldwide, notably in the USA (Southwest), India, Brazil, and Russia.
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