Source : Webster's Revised Unabridged Dictionary (1913)

Celestine \Cel"es*tine\, Celestite \Cel"es*tite\,, n. [LL.
   caelestinus bine.] (Min.)
   Native strontium sulphate, a mineral so named from its
   occasional delicate blue color. It occurs crystallized, also
   in compact massive and fibrous forms.

Source : WordNet®

celestite
     n : a mineral consisting of strontium sulphate