cyanite


From The Collaborative International Dictionary of English v.0.48:

Cyanite \Cy"a*nite\ (-n?t), n. [See Cyanic.] (Min.)
   A mineral occuring in thin-bladed crystals and crystalline
   aggregates, of a sky-blue color. It is a silicate of
   aluminium. [Written also kyanite.]
   [1913 Webster] cyanobacterium
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