crys·tal·lite /ˈkrɪstəˌlaɪt/
  雛晶; 微晶
  crystallite
  微晶
  Crys·tal·lite n.  Min. A minute mineral form like those common in glassy volcanic rocks and some slags, not having a definite crystalline outline and not referable to any mineral species, but marking the first step in the crystallization process. According to their form crystallites are called trichites, belonites, globulites, etc.
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  crystallite
       n : any of numerous minute rudimentary crystalline bodies of
           unknown composition found in glassy igneous rock