sedimentary
Red Jasper
Silicon dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Hardness: 6.5-7.0 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to dull (waxy when polished); Crystal Structure: Microcrystalline (Trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to dull (waxy when polished)
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Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to dull (waxy when polished); Crystal Structure: Microcrystalline (Trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91.
Formation & geological history
Formed from the deposition of silica-rich waters into cavities or through the chemical replacement of organic material and volcanic ash. Its red color is derived from high concentrations of iron oxide inclusions. Found in various geological ages ranging from Precambrian to more recent eras.
Uses & applications
Predominantly used for lapidary work including tumbled stones, cabochons for jewelry, ornamental carvings, and decorative home items. Historically used for seals, vases, and talismans.
Geological facts
In ancient times, Red Jasper was known as the 'Stone of Endurance' and was believed by many cultures to provide protection to warriors and heal internal organs. It is a variety of chalcedony that is completely opaque due to the high mineral impurity content.
Field identification & locations
Identify in the field by its deep red color, total opacity (will not let light through even at edges), and its ability to scratch glass but not be scratched by a steel knife. Common locations include India, Brazil, Egypt, and the southwestern United States.
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