accessory mineral

noun
See at accessory ( def 7 ).
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American Heritage
Science Dictionary
accessory mineral  
A mineral that is present in a minor amount in rocks and is not considered an essential constituent of the rock.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Tourmaline is a common accessory mineral at several copper mineralized breccia deposits.
Mafic and accessory mineral distribution in the stock and dikes is highly erratic.
Chromite ore displays octahedral crystals and occurs as an accessory mineral in ultramafic igneous rocks.
Ilmenite is a common accessory mineral in basic igneous rocks and also is concentrated in mineral sands.
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