sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs); Color: Deep brownish-red; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Trigonal (Cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep brownish-red; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Trigonal (Cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into sedimentary rock or volcanic ash, with iron oxides (hematite) providing the red pigmentation. It is primarily a cryptocrystalline variety of quartz.
Uses & applications
Used widely in jewelry as cabochons or beads, ornamental carvings, and as a popular stone for tumbling and crystal healing collections.
Geological facts
Red Jasper has been used since ancient times for amulets and carvings. It was known as the 'rain-bringer' in some indigenous cultures and was frequently mentioned in historical lapidaries.
Field identification & locations
Identify by its opaque nature, waxy to dull luster, and high hardness (it cannot be scratched by a steel knife). Commonly found in riverbeds or as nodules within larger rock formations in India, South Africa, and the USA.
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