资料来源 : pyDict

云英岩

资料来源 : Webster's Revised Unabridged Dictionary (1913)

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

资料来源 : WordNet®

greisen
     n : a granitic rock composed of quartz and mica