mineral
Eagle\'s Eye (Grey Tiger\'s Eye)
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 Mohs; Color: Grey, blue-grey, silver; Luster: Silky; Structure: Hexagonal (trigonal); Cleavage: None; Chatoyancy (cat\'s eye effect).
- Hardness
- 6
- Color
- Grey, blue-grey, silver
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 Mohs; Color: Grey, blue-grey, silver; Luster: Silky; Structure: Hexagonal (trigonal); Cleavage: None; Chatoyancy (cat\'s eye effect).
Formation & geological history
Formed through the pseudomorphism of crocidolite (asbestos) by silica. It is a variation of hawk\'s eye where the iron has not oxidized to the golden-brown of tiger\'s eye.
Uses & applications
Primarily used for ornamental carvings, jewelry (cabochons, beads), and as a collector specimen due to its unique optical properties.
Geological facts
It is a member of the chalcedony family. Unlike traditional golden tiger\'s eye, eagle\'s eye maintains a cooler, greyish-blue palette because the original iron content remains in a lower oxidation state.
Field identification & locations
Identify by its distinct silky luster and chatoyant bands that move as the stone is rotated under light. Commonly found in South Africa and Western Australia.
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