sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs Scale); Color: Red, brownish-red; Luster: Dull to vitreous; Crystal Structure: Hexagonal (trigonal) microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Red, brownish-red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs Scale); Color: Red, brownish-red; Luster: Dull to vitreous; Crystal Structure: Hexagonal (trigonal) microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed when silica-rich fluids permeate volcanic or sedimentary rocks, often in hydrothermal environments or through the replacement of volcanic ash. Its red color is derived from high iron content.
Uses & applications
Commonly used in jewelry (cabochons, beads), decorative objects, carvings, and as a popular stone for tumbling and meditation practices.
Geological facts
Red Jasper was historically known as the stone of endurance and was often used in ancient amulets and warrior talismans. It is an opaque variety of chalcedony.
Field identification & locations
Identify by its deep red color, opacity, and smooth, conchoidal fracture. It is found in many locations worldwide, including India, Brazil, USA, and South Africa.
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