Greisen

2 definitions found

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

  Greisen \Grei"sen\, n. (Min.)
     A crystalline rock consisting of quarts and mica, common in
     the tin regions of Cornwall and Saxony.
     [1913 Webster]

From WordNet (r) 2.0 [wn]:



  greisen
       n : a granitic rock composed of quartz and mica