gieseckite


From The Collaborative International Dictionary of English v.0.48:

Gieseckite \Gie"seck*ite\, n. [Named after Karl Giesecke.]
   (Min.)
   A mineral occurring in greenish gray six-sided prisms, having
   a greasy luster. It is probably a pseudomorph after
   el[ae]olite.
   [1913 Webster]
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