metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
Hardness: 7 (Mohs scale), Color: Golden to red-brown, Luster: Silky/Shimmery, Structure: Fibrous/Trigonal, Effect: Chatoyancy, Specific Gravity: 2.64-2.71
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Physical properties
Hardness: 7 (Mohs scale), Color: Golden to red-brown, Luster: Silky/Shimmery, Structure: Fibrous/Trigonal, Effect: Chatoyancy, Specific Gravity: 2.64-2.71
Formation & geological history
Formed when quartz replaces fibrous crocidolite (blue asbestos) through a pseudomorphic process. The iron in the original mineral oxidizes, creating the golden color. Predominantly found in Precambrian iron formations.
Uses & applications
Extensively used in jewelry (cabochons, beads, rings), ornamental carvings, and as a popular collector's stone due to its chatoyant optical effect.
Geological facts
Tiger's Eye is a classic example of a pseudomorph; it maintains the fibrous structure of the original crocidolite mineral but is chemically converted to silica quartz. The 'eye' effect moves as the stone is turned in light.
Field identification & locations
Identified by its distinctive golden-brown bands and silky luster that displays a moving cat's-eye effect. Common locations include South Africa, Australia, Burma, India, and the United States.
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