sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs). Color: Brick red to brownish-red. Luster: Vitreous to waxy. Structure: Microcrystalline (Cryptocrystalline). Cleavage: None, exhibits conchoidal fracture. Opaque.
- 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. Structure: Microcrystalline (Cryptocrystalline). Cleavage: None, exhibits conchoidal fracture. Opaque.
Formation & geological history
Formed from the precipitation of silica in sedimentary environments or hydrothermal veins. The red color comes from iron oxide (hematite) inclusions incorporated during formation, often in Precambrian or Paleozoic formations.
Uses & applications
Widely used as an ornamental stone, for lapidary work like cabochons, beads, and carvings. Historically used for making tools and seals.
Geological facts
Red Jasper is known as a stone of endurance. In ancient times, it was often called the 'blood of Mother Earth' due to its deep red color. It is a dense variety of chalcedony.
Field identification & locations
Identify by its solid red color, high hardness (cannot be scratched by a steel knife), and smooth, shell-like fracture surfaces. Frequently found in riverbeds or desert regions globally.
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