sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Vitreous to waxy; Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; Opaque transparency.
- Hardness
- 6
- Color
- Brick red to brownish red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Vitreous to waxy; Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; Opaque transparency.
Formation & geological history
Formed when microcrystalline quartz precipitates from silica-rich hydrothermal fluids or within sedimentary environments. The red color is caused by iron oxide (Hematite) impurities. Often found as nodules or water-worn river cobbles.
Uses & applications
Used for lapidary work, decorative carvings, jewelry (cabochons), and as a healing stone in metaphysical practices. Historically used for making tools and seals.
Geological facts
Red Jasper has been used for ornamentation for thousands of years. In ancient Egypt, it was linked to the fertility of Mother Isis and used in protective amulets. It is one of the birthstones for Mars.
Field identification & locations
Identify by its smooth, waxy feel when wet, high hardness (cannot be scratched by steel), and opaque red body with occasional veining. Commonly found in river beds, beaches, and desert plains globally.
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