metamorphic
Tiger's Eye
Silicified Riebeckite Asbestos (SiO2 with inclusions)
Hardness: 7 Mohs; Color: Golden brown to yellowish brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Specific Gravity: 2.64-2.71
- Hardness
- 7 Mohs
- Color
- Golden brown to yellowish brown
- Luster
- Silky
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Physical properties
Hardness: 7 Mohs; Color: Golden brown to yellowish brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Specific Gravity: 2.64-2.71
Formation & geological history
Formed through the pseudomorphism of crocidolite fibers (blue asbestos) by quartz. This occurs in metamorphic environments where iron oxides produce the chatoyant golden hue. Primarily associated with Precambrian banded iron formations.
Uses & applications
Extensively used in lapidary work, jewelry making (cabochons, beads), decorative carvings, and as a popular collector's mineral.
Geological facts
It exhibits 'chatoyancy' or the cat's eye effect due to its fibrous structure. When the process of silicification is incomplete, the stone remains blue and is known as Hawk's Eye.
Field identification & locations
Identified by its distinctive golden-brown bands and silky luster that reflects light in a shimmering way. Commonly found in South Africa, Australia, and Namibia.
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