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)
 
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]

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Example sentences
Grain size varies according to degree of metamorphism as does the nature of
  gangue minerals.
Quartz and calcite are usual gangue minerals, and organic debris occurs in some
  deposits.
Gangue quartz is not usually amethystine, and gangue calcite is poor in iron
  and manganese.
The method is determined by the differences in surface activity between the
  iron and gangue particles.
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