metamorphic
Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2 with iron inclusions)
Hardness: 6.5–7 (Mohs scale); Color: Golden to reddish-brown; Luster: Silky to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Chatoyancy: Strong (cat's eye effect).
- Hardness
- 6
- Color
- Golden to reddish-brown
- Luster
- Silky to vitreous
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Golden to reddish-brown; Luster: Silky to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Chatoyancy: Strong (cat's eye effect).
Formation & geological history
Formed through the pseudomorphism of crocidolite (blue asbestos) by silica. Iron from the original mineral oxidizes to create the signature golden-brown color. Predominant in Precambrian formations.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular semi-precious stone for gemstone collectors.
Geological facts
Roman soldiers wore engraved tiger's eye for protection in battle; it is known for its chatoyancy, an optical effect caused by the parallel orientation of mineral fibers.
Field identification & locations
Identify in the field by its distinctive golden-brown sheen and 'cat's eye' bands that move as the stone is tilted. Heavily mined in South Africa and Western Australia.
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