metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 7 Mohs; Color: Golden-brown to reddish-brown with chatoyant bands; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific gravity: 2.64-2.71
- Hardness
- 7 Mohs
- Color
- Golden-brown to reddish-brown with chatoyant bands
- Luster
- Silky
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Physical properties
Hardness: 7 Mohs; Color: Golden-brown to reddish-brown with chatoyant bands; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific gravity: 2.64-2.71
Formation & geological history
Formed through the pseudomorphism of crocidolite asbestos by silica. Iron oxides provide the characteristic golden-brown color. Found predominantly in Precambrian iron formations.
Uses & applications
Extensively used in jewelry (cabochons, beads), decorative carvings, and as a popular stone for collectors and metaphysical practitioners.
Geological facts
The 'chatoyancy' or cat-eye effect is caused by the reflection of light off the parallel mineral fibers within the stone. When cut into cabochons, it appears to shift as it moves.
Field identification & locations
Identify by its unique silky banding and the way light moves across the surface. Major deposits are found in South Africa (Griualand West) and Western Australia.
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