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2017 Word of the Year

accessory mineral

noun
1.
See at accessory (def 7).
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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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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16
17
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