Etymology
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blende (n.)

an ore of zinc and other metals, 1680s, from German Blende, a back-formation from blenden "to blind, deceive" (see blind (adj.)). Said by German sources to be so called because it resembles lead but does not yield any.

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Definitions of blende

blende (n.)
an ore that is the chief source of zinc; consists largely of zinc sulfide in crystalline form;
Synonyms: zinc blende / sphalerite
From wordnet.princeton.edu