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Crystal lattice systems (clockwise from top left): triclinic, orthorhombic, monoclinic, tetragonal, hexagonal, trigonal, and cubic.
The American Heritage® Science Dictionary Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
This amethyst is an example of a crystal.
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