mineralological specimen
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 (Mohs), Color: Golden to red-brown, Luster: Silky/Vitreous, Structure: Hexagonal (trigonal), Cleavage: None, SG: 2.64-2.71. It exhibits prominent chatoyancy.
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Golden to red-brown, Luster: Silky/Vitreous, Structure: Hexagonal (trigonal), Cleavage: None, SG: 2.64-2.71. It exhibits prominent chatoyancy.
Formation & geological history
Formed when parallel veins of crocidolite (blue asbestos) fibers are replaced by silica (quartz) through a process of pseudomorphism while retaining the fibrous structure. Primarily occurring in association with banded iron formations.
Uses & applications
Commonly used in jewelry as cabochons, decorative carvings, beads, and as an ornamental gemstone for collectors.
Geological facts
Tiger's eye is a classic example of a pseudomorph. While it starts as the blue mineral crocidolite, the iron within the fibers oxidizes to limonite, producing the characteristic golden-brown hues.
Field identification & locations
Identified by its distinctive 'cat's eye' silky luster that shifts when the stone is turned. It is most famously found in the Northern Cape Province of South Africa and Western Australia.
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