mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 Mohs; Color: Golden to red-brown; Luster: Silky; Crystal system: Trigonal (fibrous); Specific gravity: 2.64-2.71; Notable for chatoyancy.
- Hardness
- 6
- Color
- Golden to red-brown
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 Mohs; Color: Golden to red-brown; Luster: Silky; Crystal system: Trigonal (fibrous); Specific gravity: 2.64-2.71; Notable for chatoyancy.
Formation & geological history
Formed when quartz replaces the fibrous mineral crocidolite (asbestos) while maintaining the original fibrous structure. Primarily found in metamorphosed iron formations.
Uses & applications
Extensively used in jewelry (cabochons, beads), decorative carvings, and as a popular meditation and pocket stone for collectors.
Geological facts
The shimmering effect is called chatoyancy. If the specimen is blue, it is known as Hawk's Eye. Red Tiger's Eye is often created by heat-treating the golden variety.
Field identification & locations
Identified by its distinctive golden-brown alternating bands and 'cat's eye' shimmer. Common in South Africa, Australia, and Namibia. Best found in areas with Precambrian rocks.
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Metamorphic
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metamorphic
Gypsum (variety Selenite or Alabaster)
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Mineral
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Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
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