gemstone
Hawk's Eye
Silicon dioxide (Quartz pseudomorph after crocidolite)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, blue-gray to blue-green color, silky to pearly luster, and chatoyant optical effect.
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Physical properties
Hardness of 7 on the Mohs scale, blue-gray to blue-green color, silky to pearly luster, and chatoyant optical effect.
Formation & geological history
Formed when quartz replaces fibrous crocidolite asbestos, preserving the chatoyant fibrous structure.
Uses & applications
Widely used in jewelry, cabochons, carvings, and as a collector specimen.
Geological facts
Hawk's eye is the blue predecessor to yellow-brown tiger's eye, as the iron within it has not yet oxidized.
Field identification & locations
Easily identified by its deep blue chatoyancy (cat's eye effect), primarily sourced from South Africa.
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