sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to dull (polished in image); Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to dull (polished in image)
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to dull (polished in image); Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica-rich micro-organisms or volcanic ash into sedimentary basins, later enriched by iron oxides. It occurs in hydrothermal veins or as a secondary mineral in igneous rocks.
Uses & applications
Commonly used for tumbled stones, decorative ornaments, jewelry (cabochons), and historically for cylinder seals and amulets.
Geological facts
Ancient Egyptians associated Red Jasper with the blood of Isis and frequently carved it into protective amulets. It is an opaque variety of chalcedony.
Field identification & locations
Identify by its deep red color, smooth texture, and inability to be scratched by a steel blade. Commonly found in South Africa, India, Brazil, and the USA.
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