sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 on Mohs scale; Color: Deep red to brownish red, often with black or grey streaks; Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep red to brownish red, often with black or grey streaks
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Deep red to brownish red, often with black or grey streaks; Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Jasper is an opaque variety of chalcedony formed through the deposition of silica from hydrothermal solutions or within sedimentary rocks, where iron inclusions provide the red pigmentation. It is often found in prehistoric volcanic ash or sedimentary beds.
Uses & applications
Commonly used for lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a popular pocket stone or meditation aid in the metaphysical community.
Geological facts
Red Jasper has been used since antiquity for seals and amulets; it was mentioned in various ancient cultures as a stone of protection and physical strength. It is remarkably dense for a silicate.
Field identification & locations
Identify by its characteristic opaque brick-red color and high hardness (it cannot be scratched by a steel knife). It is commonly found in India, Brazil, USA (southwest), and South Africa. For collectors, look for high silica content and smooth tumbled surfaces.
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