'Gieseckite' definitions:

Definition of 'Gieseckite'

From: GCIDE

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]