metamorphic
Tiger's Eye (Brown/Gold variety)
Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)
Hardness: 6.5-7 (Mohs scale); Color: Golden-brown, reddish-brown to black; Luster: Silky/Vitreous; Crystal Structure: Trigonal (fibrous texture); Cleavage: None; Specific Gravity: 2.64-2.71.
- Hardness
- 6
- Color
- Golden-brown, reddish-brown to black
- Luster
- Silky/Vitreous
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Golden-brown, reddish-brown to black; Luster: Silky/Vitreous; Crystal Structure: Trigonal (fibrous texture); Cleavage: None; Specific Gravity: 2.64-2.71.
Formation & geological history
Formed through the replacement of fibrous crocidolite (asbestos) by silica (quartz). It is a pseudomorph, meaning the quartz has taken the shape of the original mineral's fibers. Variations in iron oxidation levels create the gold and brown banding.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular semi-precious stone for collectors and metaphysical enthusiasts.
Geological facts
It exhibits 'chatoyancy', or the cat's eye effect, which is a shifting band of light across its surface when tilted. It was once considered more valuable than gold in the early 19th century due to its rarity until massive deposits were found.
Field identification & locations
Identify in the field by its distinctive parallel fibrous texture and 'shimmering' golden bands that move when the stone is rotated under light. Common locations include South Africa (Griqualand West), Western Australia, Myanmar, India, and Namibia.
More like this
