volborthite


From The Collaborative International Dictionary of English v.0.48:

Volborthite \Vol"borth*ite\, n. [So named after Volborth, who
   first discovered it.] (Min.)
   A mineral occurring in small six-sided tabular crystals of a
   green or yellow color. It is a hydrous vanadate of copper and
   lime.
   [1913 Webster]
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