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Glossary of Terms

Hexagonal

Any mineral that falls under the following specifications belongs to the hexagonal crystal system:
Four axes, three are equal in length and lie at an angle of 120° from each other. The fourth is either longer or shorter but must be at a right angle toward the other corners.
(See also Trigonal)

3D Animated Illustration of a Trapezohedron
Crystals kindly provided by Smorf

 

Beryl is a Prominent Member of the Hexagonal Crystal System



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