sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from hydrothermal solutions or volcanic ash, followed by compaction and cementing. The red color is caused by the presence of iron (III) oxide.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons, beads), decorative carvings, and as a healing stone in metaphysical practices.
Geological facts
Red Jasper has been used since antiquity for seals, amulets, and ornamentation. In ancient Egypt, it was associated with the blood of Isis and used in protective amulets.
Field identification & locations
Identify by its opaque nature (unlike Carnelian), matte luster when unpolished, and the ability to scratch glass. Found globally, notably in India, Brazil, USA, and South Africa.
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