microcrystalline
  (a.)微晶的
  mi·cro·crys·tal·line /ˌmaɪkroˈkrɪstələn , ˌlɪn/ 形容詞
  微晶體的,微晶的
  Mi·cro·crys·tal·line a.  Crystallog. Crystalline on a fine, or microscopic, scale; consisting of fine crystals; as, the ground mass of certain porphyrics is microcrystalline.
  ◄ ►
  microcrystalline
       adj : containing crystals that are visible only under a microscope