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accessory mineral

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noun
  1. See at accessory(def 7).
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

accessory mineral in Science

accessory mineral

  1. A mineral that is present in a minor amount in rocks and is not considered an essential constituent of the rock.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.