mineral
Red Tiger's Eye
Silicified Crocidolite (SiO2 with iron oxide inclusions)
Hardness: 7 on Mohs scale, Luster: Vitreous to silky, Color: Deep reddish-brown with chatoyant bands, Crystal System: Trigonal (microcrystalline quartz), Specific Gravity: 2.64-2.71
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Physical properties
Hardness: 7 on Mohs scale, Luster: Vitreous to silky, Color: Deep reddish-brown with chatoyant bands, Crystal System: Trigonal (microcrystalline quartz), Specific Gravity: 2.64-2.71
Formation & geological history
Formed when blue crocidolite (asbestos) is replaced over time by quartz (pseudomorphism). Red tiger's eye is typically created by heat-treating natural yellow/brown tiger's eye to alter iron oxide oxidation states.
Uses & applications
Used extensively as an ornamental gemstone, for lapidary work, cabochons, beads, carvings, and in metaphysical/crystal collections.
Geological facts
The striking silky optical effect seen in tiger's eye is known as chatoyancy ('cat's eye' effect), which is caused by parallel fibrous structures reflecting light.
Field identification & locations
Identified by its distinctive chatoyant silky luster and rich red-brown banding. Commonly found in South Africa, Australia, India, and Brazil.
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