sedimentary
Red Jasper
Jasper (Silicon Dioxide with Hematite inclusions), SiO2
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep brownish-red; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to deep brownish-red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep brownish-red; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from hydrothermal solutions or in sedimentary environments. Its red color is derived from high iron (hematite) content. It can be found in prehistoric volcanic ash beds or as nodules in limestone.
Uses & applications
Used primarily in lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a popular stone for chakra healing and crystal collecting.
Geological facts
Jasper has been used as a gemstone since antiquity; it was mentioned in the Bible and used by ancient Egyptians for amulets. It is an opaque variety of chalcedony.
Field identification & locations
Identify by its rich red color, extreme hardness (it will scratch glass), and smooth, conchoidal fracture. Often found as tumbled river stones or as blocky deposits in desert regions like the American Southwest.
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