The Collaborative International Dictionary of English v.0.48:

Haidingerite \Hai"ding*er*ite\ (h[imac]"d[i^]ng*[~e]r*[imac]t),
   n. (Min.)
   A mineral consisting chiefly of the arseniate of lime; -- so
   named in honor of W. Haidinger, of Vienna.
   [1913 Webster]