metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: golden-brown to yellow; Luster: silky; Crystal structure: hexagonal/trigonal; Chatoyant (shimmering) effect; Specific gravity: 2.64-2.71
- Hardness
- 6
- Color
- golden-brown to yellow
- Luster
- silky
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: golden-brown to yellow; Luster: silky; Crystal structure: hexagonal/trigonal; Chatoyant (shimmering) effect; Specific gravity: 2.64-2.71
Formation & geological history
Formed when quartz replaces the mineral crocidolite through a pseudomorphic process. It is primarily found in iron formations within metamorphic rock environments, notably the Hammersley Range in Australia and the Griqualand West region of South Africa.
Uses & applications
Used extensively in jewelry for beads, cabochons, and rings; also used as an ornamental stone for carvings, paperweights, and metaphysical collections.
Geological facts
The chatoyancy (cat's-eye effect) is caused by the parallel growth of quartz crystals and altered amphibole fibers. It was once considered more valuable than gold until large deposits were discovered in the late 19th century.
Field identification & locations
Identified by its distinctive golden-brown bands and the way the light reflects off the fibrous structure. It is easy to find in South Africa and Australia. Collectors should look for a vibrant shift in color when tilting the stone.
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