1) Kyanite 2) Mineral 1) Kyanite 
• (n.) A mineral occuring in thin-bladed crystals and crystalline aggregates, of a sky-blue color. It is a silicate of aluminium.
Cy'a·nite noun [ 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 .]
Cyanite or kyanite is an accessory mineral of the garnet family found both massive and in regular crystals in gneiss and mica schist. It often found with garnet and corundum. It is used in the production of refractory porcelains. It has the formulae Al2SiO5 and a relative hardness of 7. Its prevailing colour is blue but of varying shades.