sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica in hydrothermal veins or as a chemical precipitate in sedimentary rocks, often enriched with iron minerals that provide the red color. Commonly found in Precambrian or Paleozoic formations.
Uses & applications
Extensively used for lapidary work, jewelry (beads, cabochons), ornamental vases, and as a healing stone in metaphysical practices.
Geological facts
Red jasper was highly prized in the ancient world as a stone of protection and was often used in the seals of high-ranking Egyptian officials. It is an opaque variety of chalcedony.
Field identification & locations
Identified in the field by its deep red color, conchoidal fracture, and extreme hardness (cannot be scratched by a steel knife). Commonly found in riverbeds and desert environments in regions like India, Brazil, and the Southwestern USA.
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