sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide impurities), SiO2
Hardness: 6.5-7 on Mohs scale; Color: Terracotta red to deep reddish-brown; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Terracotta red to deep reddish-brown
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Terracotta red to deep reddish-brown; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from hydrothermal solutions or volcanic ash in sedimentary environments. Its red color comes from high concentrations of iron inclusions (hematite). It can be found in formations ranging from the Precambrian to the Cenozoic era.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and carvings. It is popular in the metaphysical community and used industrially as an ornamental stone in mosaics and interior finishes.
Geological facts
Jasper has been a favorite gemstone since antiquity; it is mentioned in the Bible as one of the stones in the High Priest's breastplate. Red Jasper is often called the 'stone of endurance' in folklore.
Field identification & locations
Identify in the field by its opaque nature (unlike agate which is translucent), its smooth conchoidal (shell-like) fracture when broken, and its inability to be scratched by a steel knife. It is common in riverbeds and desert regions of the Southwestern USA, India, Brazil, and Australia.
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