The Collaborative International Dictionary of English v.0.48:

Liroconite \Li*roc"o*nite\ (l[-i]*r[o^]k"[-o]*n[imac]t), n. [Gr.
   leiro`s pale + koni`a powder.] (Min.)
   A hydrated arseniate of copper, occurring in obtuse pyramidal
   crystals of a sky-blue or verdigris-green color.
   [1913 Webster]