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accessory mineral

See at accessory (def 7). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for accessory mineral
  • 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.
accessory mineral in Science
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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