The Collaborative International Dictionary of English v.0.48:

Schiller \Schil"ler\, n. [G., play of colors.] (Min.)
   The peculiar bronzelike luster observed in certain minerals,
   as hypersthene, schiller spar, etc. It is due to the presence
   of minute inclusions in parallel position, and is sometimes
   of secondary origin.
   [1913 Webster]

   Schiller spar (Min.), an altered variety of enstatite,
      exhibiting, in certain positions, a bronzelike luster.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Schiller
    n 1: German romantic writer (1759-1805) [syn: Schiller,
         Johann Christoph Friedrich von Schiller]