sedimentary
Red Jasper
Chalcedony (SiO2 with iron oxide impurities)
Hardness: 6.5-7 on Mohs scale; Color: Terracotta red to deep brick red; Luster: Dull to vitreous; Crystal structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Terracotta red to deep brick red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Terracotta red to deep brick red; Luster: Dull to vitreous; Crystal structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sedimentary rock, often in oceanic environments. The red color comes from iron oxide (hematite) inclusions incorporated during formation.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons), ornamental carvings, stone seals, and as an grounding stone in metaphysical practices.
Geological facts
Jasper is an opaque variety of chalcedony. In ancient times, red jasper was known as the 'blood of Mother Earth' and was used in ancient Egypt for amulets and jewelry to symbolize vitality.
Field identification & locations
Identify by its deep red color, opacity (it will not let light through even at the edges), and smooth, shell-like fracture pattern. Commonly found in Arizona (USA), India, Brazil, and South Africa.
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