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accessory mineral

American  

noun

Petrography.
  1. a mineral that is present in small amounts in a rock and has no bearing on the classification of the rock, as zircon in granite.


accessory mineral Scientific  
  1. A mineral that is present in a minor amount in rocks and is not considered an essential constituent of the rock.


Example Sentences

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It is frequently present as an accessory mineral in sulphide deposits containing ores of gold, copper, silver, lead, and zinc.

From Project Gutenberg