thuringite

from The Collaborative International Dictionary of English v.0.48
Thuringite \Thu*rin"gite\, n. [From Thuringia, where it is
   found.] (Min.)
   A mineral occurring as an aggregation of minute scales having
   an olive-green color and pearly luster. It is a hydrous
   silicate of aluminia and iron.
   [1913 Webster]
    

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