hawk's-eye

(Minerals) a dark blue variety of the mineral crocidolite: a semiprecious gemstone

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

Mentioned in

argus-eyed
gem
hawk
Hawk-Eye
hawk-eyed
keen-sighted
lynx-eyed
quick-sighted
sharp-eyed
sharp-sighted

References in periodicals archive

While studying the chemistry of hawk's-eye, a blue form of tiger's-eye, he found that the gem was almost entirely quartz but that it also contained fibers of crocidolite, an often bluish, iron-bearing form of asbestos.

Eye of the tiger: discovery about gem's structure overturns old theory

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