Sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs scale); Color: Bricky 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
- Bricky red to brownish red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Bricky 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-bearing solutions, often in marine environments where volcanic ash or siliceous organisms are present. The red color is caused by high concentrations of iron oxide (hematite) during formation.
Uses & applications
Used primarily in lapidary arts for gemstones, cabochons, beads, and decorative carvings. Historically used for seals and amulets.
Geological facts
Ancient Egyptians wore Red Jasper amulets to increase strength and fertility. It is known as a stone of endurance and is often used in modern crystal healing as a grounding stone.
Field identification & locations
Identify by its opaque nature, smooth waxy surface when tumbled, and its inability to be scratched by a steel pocket knife. Commonly found in riverbeds or gravel deposits globally, including the USA, India, and Brazil.
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