sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide impurities, SiO2)
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into sediment or volcanic ash. The red color is caused by the inclusion of hematite (iron oxide). This occurs in various geological ages from Precambrian to recent periods.
Uses & applications
Used primarily as decorative gemstones, in jewelry (cabs, beads), as metaphysical 'healing' stones, and historically for tools and seals.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back in Arabic, Persian, Greek, and Latin. It is often referred to as 'The Supreme Nurturer' in gemstone folklore.
Field identification & locations
Identify in the field by its opaque nature (never translucent), smooth conchoidal fracture, and inability to be scratched by a steel knife. Commonly found in riverbeds or desert regions globally, especially in the Western US, Brazil, and India.
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