sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs); Color: Brick red with dark inclusions; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red with dark inclusions
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Brick red with dark inclusions; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic or sedimentary environments, where microcrystalline quartz mixes with iron oxides during the silicification process.
Uses & applications
Used primarily in lapidary work for cabochons, beads, carvings, and tumbled stones; also historically used for seal stones and ritual objects.
Geological facts
The red color comes from iron oxide (hematite). In ancient cultures, it was known as the 'bringer of courage' and was often used to adorn the breastplates of high priests and warriors.
Field identification & locations
Identify in the field by its opaque red color, conchoidal fracture pattern, and inability to be scratched by a steel knife. Commonly found in riverbeds and desert environments globally, notably in India, Brazil, and the USA.
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