蓝晶石

[ noun ]
a grey or greenish-blue mineral consisting of aluminum silicate in crystalline form; occurs in metaphoric rock, used as a refractory
<noun.substance>

Kyanite \Ky"a*nite\, n.
See {Cyanite}.

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}.]