sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to vitreous when polished; Crystal Structure: Hexagonal (Trigonal), microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Dull to vitreous when polished
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to vitreous when polished; Crystal Structure: Hexagonal (Trigonal), microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of silica from either volcanic ash or cooling hydrothermal fluids. Its red color is derived from iron (hematite) inclusions that saturated the silica during the sedimentation process.
Uses & applications
Commonly used in lapidary work for making cabochons, beads, and decorative carvings. It is popular in jewelry and spiritual collections as a 'grounding' stone.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as the 'supreme nurturer' and has been found in archaeological sites spanning thousands of years, from ancient Egypt to Minoan Crete.
Field identification & locations
Identify by its solid, opaque red color and smooth, conchoidal fracture. Unlike some other red stones, it will not scratch easily with a steel knife. It is ubiquitous globally, with major deposits in India, Brazil, and the USA.
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