metamorphic
Tiger's Eye (often misinterpreted as Gold Ore in this context)
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 (Mohs scale); Color: Golden-yellow to brown; Luster: Silky; Structure: Fibrous/trigonal; Cleavage: None; Specific Gravity: 2.64-2.71; Notable for chatoyancy.
- Hardness
- 6
- Color
- Golden-yellow to brown
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Golden-yellow to brown; Luster: Silky; Structure: Fibrous/trigonal; Cleavage: None; Specific Gravity: 2.64-2.71; Notable for chatoyancy.
Formation & geological history
Formed when quartz replaces the blue crocidolite asbestos fibers through a process of pseudomorphism, typically found in iron-rich metamorphic formations. Primary deposits date back to the Proterozoic era.
Uses & applications
Used extensively in the jewelry industry for cabochons, beads, and carvings. Also popular in lapidary arts and as a metaphysical collector's stone.
Geological facts
The 'gold' appearance is caused by the oxidation of iron within the fibrous structure. Despite the user caption 'natural gold', this specimen is a silicate mineral and contains no actual metallic gold.
Field identification & locations
Identify by its 'cat's eye' effect (chatoyancy) which shifts light as the stone is turned. Commonly found in South Africa (Griqualand West), Western Australia, and India.
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