sedimentary (physico-chemical)
Red Jasper (with Quartz inclusions)
Silicon Dioxide (SiO2)
Hardness: 6.5–7 (Mohs); Color: Brick red with white or milky patches; Luster: Vitreous to waxy; Crystal structure: Microcrystalline (trigonal); Cleavage: None; Specific gravity: 2.58–2.91
- Hardness
- 6
- Color
- Brick red with white or milky patches
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 (Mohs); Color: Brick red with white or milky patches; Luster: Vitreous to waxy; Crystal structure: Microcrystalline (trigonal); Cleavage: None; Specific gravity: 2.58–2.91
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic or sedimentary cavities. The red color is derived from iron (hematite) inclusions within the cryptocrystalline quartz structure. While it can be found in layers dating back to the Precambrian, many specimens are secondary deposits found in riverbeds.
Uses & applications
Used primarily in lapidary work for cabochons, beads, and carvings. Also used as a decorative stone in landscaping and widely collected by mineral enthusiasts as a 'healing stone' in metaphysical practices.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek 'iaspis,' meaning spotted stone. It was a favorite gemstone in the ancient world, mentioned in both Greek and Roman literature and the Bible as a symbol of protection and endurance.
Field identification & locations
Identify in the field by its opacity (it does not transmit light like agate), its waxy feel when smooth, and its inability to be scratched by a steel knife. Commonly found in riverbeds, desert washes, and near volcanic outcroppings globally, particularly in the Western US, Brazil, and India.
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Chert (Yellow/Tan Variety)
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Limonite (Ironstone Concretion)
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Orange Calcite (Cleavage Rhomb)
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