sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Dull to vitreous, Crystal structure: Microcrystalline/Cryptocrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Dull to vitreous, Crystal structure: Microcrystalline/Cryptocrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of volcanic ash or silica-rich sediments in an oxygen-rich environment where iron oxides develop. Often found in hydrothermal veins and ancient seafloor deposits spanning several geological eras.
Uses & applications
Commonly used as a gemstone for jewelry (cabochons, beads), decorative ornaments, stone carvings, and it is a popular specimen for rock tumbling and metaphysical collections.
Geological facts
Jasper is an opaque variety of chalcedony. The red color is specifically caused by high concentrations of iron inclusions. Historically known as a stone of endurance and nurturing.
Field identification & locations
Identify by its opaque nature (light will not pass through the edges), its deep red color, and its hardness (it can scratch glass). Commonly found in riverbeds and desert environments in regions like India, Brazil, and the Southwestern USA.
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