sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish red; Luster: Vitreous to waxy; 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 waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish red; Luster: Vitreous to waxy; 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 in cavities or volcanic environments, later enriched with iron oxides that provide the red pigment. It is a variety of chalcedony.
Uses & applications
Primarily used for lapidary work including cabochons, beads, and carvings. Also popular in jewelry and as a grounding stone in metaphysical practices.
Geological facts
The name Jasper comes from the Greek word 'iaspis', meaning spotted stone. It has been used for seals and jewelry since antiquity in Egyptian and Minoan cultures.
Field identification & locations
Identify by its deep red color, high hardness (cannot be scratched by a steel blade), and smooth, often waxy surface when polished. Found globally with major deposits in India, Russia, Brazil, and the USA.
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