gemstone
Tiger's Eye
Silicon Dioxide (Quartz pseudomorph after crocidolite)
Hardness of 7 on the Mohs scale, golden-brown to yellow-brown color with bands of dark brown, silky to vitreous luster, trigonal crystal system (pseudomorphous), specific gravity of 2.64 to 2.71.
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Physical properties
Hardness of 7 on the Mohs scale, golden-brown to yellow-brown color with bands of dark brown, silky to vitreous luster, trigonal crystal system (pseudomorphous), specific gravity of 2.64 to 2.71.
Formation & geological history
Formed when quartz concurrently replaces crocidolite (blue asbestos) while preserving the fibrous structure, creating a chatoyant optical effect.
Uses & applications
Widely used in ornamental carvings, beads, cabochons for jewelry, and as a popular collector's mineral specimen.
Geological facts
Tiger's eye is a classic example of pseudomorphism, where one mineral is gradually replaced by another while retaining the original shape and structure.
Field identification & locations
Easily identified by its characteristic golden-brown chatoyancy (cat's-eye effect) when moved in the light. Major deposits are found in South Africa and Western Australia.
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