sedimentary
Red Jasper
Silicon dioxide with iron impurities (SiO2)
Hardness: 6.5-7 Mohs; Color: Deep Brick Red to Brownish Red; Luster: Vitreous to Waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep Brick Red to Brownish Red
- Luster
- Vitreous to Waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Deep Brick Red to Brownish Red; Luster: Vitreous to Waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed when silica-rich fluids permeate through volcanic ash or sedimentary rocks, with the red color caused by iron inclusions. This specimen appears to be tumbled and polished from its raw form.
Uses & applications
Mainly used in jewelry (cabochons, beads), decorative carvings, and as a popular stone for collectors and metaphysical practices. Historically used for seals and amulets.
Geological facts
Red Jasper has been known as the 'stone of endurance' throughout history. Ancient Egyptians associated it with the blood of Isis, and it was used extensively in signet rings and ornamentation in ancient Greece and Rome.
Field identification & locations
Identify by its solid red color, lack of transparency (it is opaque), and high hardness (it cannot be scratched by a steel knife). It is commonly found in India, Brazil, Madagascar, and the USA.
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