The Collaborative International Dictionary of English v.0.48:

Ophite \O"phite\, n. [L. ophites, Gr. 'ofi`ths (sc. ?), a kind
   of marble spotted like a serpent: cf. F. ophite.] (Min.)
   A greenish spotted porphyry, being a diabase whose pyroxene
   has been altered to uralite; -- first found in the Pyreness.
   So called from the colored spots which give it a mottled
   appearance. -- O*phi"ic, a.
   [1913 Webster]