sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; 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; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic ash or fine-grained sediments, with its red color derived from iron oxide (hematite) inclusions during the diagnostic process.
Uses & applications
Widely used in jewelry (cabochons, beads), decorative ornaments, stone carving, and as a popular specimen for rock tumbling and metaphysical collections.
Geological facts
The name Jasper comes from the Greek word 'iaspis', meaning spotted stone. It has been used since antiquity for royal seals and was mentioned in the Bible as a gemstone in the High Priest's breastplate.
Field identification & locations
Identify by its opaque red color, conchoidal fracture (smooth, curved breaks), 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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