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augen in Science

augen

[ougən]
  1. A large mineral grain or grain cluster having the shape of an eye in cross-section and occurring in foliated metamorphic rocks such as schist and gneiss. Augens form when large mineral crystals are sheared and deformed during the process of metamorphism.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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