sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)
Hardness: 6.5 - 7 on Mohs scale; Color: Brick red to deep brown; Luster: Dull to waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58 - 2.91
- Hardness
- 6
- Color
- Brick red to deep brown
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5 - 7 on Mohs scale; Color: Brick red to deep brown; Luster: Dull to waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58 - 2.91
Formation & geological history
Formed from the deposition of silica from water or through the replacement of organic materials. The red color is caused by the presence of hematite (iron oxide). It is often found in prehistoric sedimentary basins or as nodules in volcanic rocks.
Uses & applications
Used primarily as decorative gemstones, in jewelry making (cabochons, beads), lapidary arts, and as a material for ornamental carvings. Historically used for making tools due to its conchoidal fracture which creates sharp edges.
Geological facts
In antiquity, Red Jasper was known as a stone of endurance and was often used in Egyptian amulets. It is one of the birthstones for the zodiac sign Aries. Its name is derived from the Greek word 'iaspis', meaning spotted stone.
Field identification & locations
Identify in the field by its deep red color, smooth texture when water-worn, and inability to be scratched by a steel knife. Common locations include riverbeds, beaches, and desert plains in regions like the Western USA (Oregon, Idaho), India, Brazil, and South Africa.
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