mineral
Tiger's Eye
Silicon Dioxide (Quartz pseudomorph after crocidolite), SiO2
Hardness of 7 on the Mohs scale, golden to reddish-brown color with a characteristic silky chatoyancy (cat's-eye effect), fibrous crystal structure, no distinct cleavage, specific gravity of 2.64 to 2.71, and vitreous to silky luster.
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Physical properties
Hardness of 7 on the Mohs scale, golden to reddish-brown color with a characteristic silky chatoyancy (cat's-eye effect), fibrous crystal structure, no distinct cleavage, specific gravity of 2.64 to 2.71, and vitreous to silky luster.
Formation & geological history
Formed when quartz continuously replaces fibrous crocidolite (blue asbestos) during the process of pseudomorphism, preserving the original fibrous structure while changing the chemical composition to silica.
Uses & applications
Widely used in jewelry making, ornamental carvings, beads, and as a popular collectible gemstone.
Geological facts
The shimmering chatoyant effect is caused by the parallel arrangement of quartz fibers reflecting light. Historically, Roman soldiers wore tiger's eye to protect them in battle.
Field identification & locations
Easily identifiable by its distinctive golden-brown stripes and moving band of light when rotated. Found primarily in South Africa, Western Australia, the USA, Canada, and India.
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