sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Brick red with possible tan/yellow banding; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red with possible tan/yellow banding
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Brick red with possible tan/yellow banding; 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 solutions or volcanic ash, followed by microcrystalline growth. The red color is typically caused by iron inclusions. Found in sedimentary deposits and volcanic regions worldwide.
Uses & applications
Commonly used as a gemstone for jewelry, decorative carvings, metaphysical 'healing' stones, and ornamental lapidary work.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as the 'supreme nurturer' and has been used in seals and amulets for thousands of years by various cultures.
Field identification & locations
Identify in the field by its opacity (unlike translucent carnelian), its high hardness, and its characteristic waxy or smooth feel when polished. Commonly found in stream beds or coastal areas in the western US, India, and Brazil.
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