mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Forms when silica-rich fluids permeate through volcanic ash or sedimentary deposits. The red color is caused by high concentrations of iron oxide (hematite). It can be found in various geological ages from Precambrian to more recent eras.
Uses & applications
Primarily used in jewelry (lapidary), ornamental carvings, and as a healing stone in metaphysical practices. Historically used to make tools and weapons due to its durability.
Geological facts
Jasper has been a favorite gemstone since antiquity; it is mentioned in numerous ancient texts including the Bible. The name comes from the Greek word 'iaspis', meaning spotted stone.
Field identification & locations
Identify in the field by its opaque nature, smooth waxy surface when wet or polished, and vibrant red color. Commonly found in riverbeds, deserts, and volcanic regions globally, such as the American Southwest, India, and Brazil.
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