The Collaborative International Dictionary of English v.0.48:

Spodumene \Spod"u*mene\ (sp[o^]d"[-u]*m[=e]n; 135), n. [Gr. ?,
   p. pr. pass. from ? to burn to ashes, from spodo`s ashes; cf.
   F. spodum[`e]ne.] (Min.)
   A mineral of a white to yellowish, purplish, or emerald-green
   color, occurring in prismatic crystals, often of great size.
   It is a silicate of alumina and lithia. See Hiddenite.
   [1913 Webster]

WordNet (r) 3.0 (2006):

spodumene
    n 1: a pyroxene mineral consisting of lithium aluminum silicate;
         a source of lithium