Aphanite

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Aphanite \Aph"a*nite\, n. [Gr. ? invisible; 'a priv. + ? to
     appear.] (Min.)
     A very compact, dark-colored ?ock, consisting of hornblende,
     or pyroxene, and feldspar, but neither of them in perceptible
     grains.
     [1913 Webster]



From WordNet (r) 2.0 [wn]:

  aphanite
       n : fine-grained homogeneous rock (such as basalt) containing
           minerals undetectable by the naked eye