sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91.
Formation & geological history
Formed through the deposition of silica from water-rich environments or volcanic ash, often associated with banded iron formations. The red color is derived from high hematite (iron) content. It is typically hundreds of millions of years old.
Uses & applications
Used primarily as decorative gemstones for jewelry (cabochons), talismans, lapidary carvings, and ornamental stones. Historically used for making tools and seals.
Geological facts
Ancient Egyptians used red jasper in amulets to represent the fertilizing blood of Isis. It is known as a stone of endurance and nurturing in various cultural mythologies.
Field identification & locations
Identify by its deep red color, opaque transparency, and the fact that it cannot be scratched by a steel knife. Commonly found in riverbeds or desert areas in India, Brazil, USA, and South Africa.
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