sedimentary
Red Jasper
SiO2 (Silicon Dioxide with Iron Oxide impurities)
Hardness: 6.5-7 (Mohs scale), Color: Red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Trigonal (Microcrystalline), 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: Red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed when fine particulate materials are cemented by silica, often in volcanic or sedimentary environments. The red color is caused by iron inclusions. Found in layers or nodules within iron-rich deposits.
Uses & applications
Used extensively in jewelry as cabochons, decorative carvings, lapidary art, and occasionally for historical tools due to its hardness.
Geological facts
Known as the stone of endurance in folklore. Red jasper is a variety of chalcedony that is opaque due to the high mineral content. It was a popular gemstone in the ancient world, mentioned in both Greek and Roman literature.
Field identification & locations
Identify by its smooth, waxy surface when wet and its distinctive opaque red color. It cannot be scratched by a steel knife. Commonly found in riverbeds, beaches, and desert pavements worldwide.
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