sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs); Color: Deep 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
- Deep red to brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep 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-rich fluids in volcanic ash or sedimentary beds during the Precambrian to modern eras. The distinct red hue comes from high iron/hematite content during solidification.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and carvings; historically used for seals, amulets, and architectural inlay.
Geological facts
In ancient times, Red Jasper was known as the 'Stone of Endurance' and was believed by the Egyptians to represent the fertilizing blood of Mother Isis.
Field identification & locations
Identify by its opaque nature (unlike carnelian), dull waxy luster before polishing, and inability to be scratched by a steel knife. Frequently found in riverbeds and gravel deposits worldwide, notably in India, Brazil, and the USA.
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