sedimentary
Red Jasper
Silicon Dioxide (SiO2), microcrystalline quartz variety
Hardness: 6.5 to 7 on the Mohs scale. Color: Brick red to brownish-red, often with lighter quartz veining or mottling. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58 to 2.91.
- Hardness
- 6
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale. Color: Brick red to brownish-red, often with lighter quartz veining or mottling. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58 to 2.91.
Formation & geological history
Formed via the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often associated with iron-rich deposits which give it the characteristic red color.
Uses & applications
Used in ornamental carvings, cabochons for jewelry, tumbled stones, and decorative objects.
Geological facts
Red jasper has been used since ancient times for talismans, seals, and jewelry. It is mentioned in various historical texts for its grounding properties.
Field identification & locations
Easily identified by its opaque red color, waxy-to-dull luster, and high hardness (scratches glass). Commonly found worldwide in riverbeds, marine sedimentary deposits, and hydrothermal veins.
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