gangue

[gang]
noun
rock or mineral matter of no value occurring with the metallic ore in a vein or deposit.

Origin:
1800–10; < French < German Gang; see gang1

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World English Dictionary
gangue or gang (ɡæŋ) [Click for IPA pronunciation guide]
 
n
valueless and undesirable material, such as quartz in small quantities, in an ore
 
[C19: from French gangue, from German Gang vein of metal, course; see gang1]
 
gang or gang
 
n
 
[C19: from French gangue, from German Gang vein of metal, course; see gang1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Gangue is always a great word to know.
So is zedonk. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
the offspring of a zebra and a donkey.
Example sentences
Cinnabar and stibnite occurred in a gangue consisting chiefly of quartz and
  kaolin, with a small amount of dolomite.
The method is determined by the differences in surface activity between the
  iron and gangue particles.
Grain size varies according to degree of metamorphism as does the nature of
  gangue minerals.
The predominant gangue minerals are siderite and quartz.
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