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accessory mineral

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noun Petrography.
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.
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Scientific definitions for accessory mineral

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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