metamorphic
Red Tiger's Eye
Silicified Crocidolite (SiO2 with iron oxide inclusions)
Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown to mahogany; Luster: Silky; Crystal structure: Hexagonal/Trigonal (pseudomorph after asbestiform crocidolite); Specific gravity: 2.64-2.71.
- Hardness
- 6
- Color
- Reddish-brown to mahogany
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown to mahogany; Luster: Silky; Crystal structure: Hexagonal/Trigonal (pseudomorph after asbestiform crocidolite); Specific gravity: 2.64-2.71.
Formation & geological history
Formed through the pseudomorphism of crocidolite fibers by quartz. The red color is typically created by gentle heating of gold tiger's eye, which oxidizes the iron content. It is primarily found in metamorphic iron formations.
Uses & applications
Mainly used in jewelry (cabochons, beads), decorative carvings, and as a popular pocket stone for crystal collectors and metaphysical practitioners.
Geological facts
Also known as 'Ox Eye' or 'Bull's Eye'. While it can occur naturally through geothermal heating, most red tiger's eye on the market is the result of controlled heat treatment of the gold variety.
Field identification & locations
Identify by its strong chatoyancy (cat's-eye effect) and fibrous appearance. It is common in the Griquatown West area of South Africa, as well as Western Australia, Namibia, and India.
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