Basics of Mineralogy

Crystal Systems and Optical Classes

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Last updated: September 14, 2025

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Basics of Mineralogy

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Side Lengths and Angles	Crystal System
(a = b = c) Forms a large cube with all 90* angles	Isometric
(a = b ≠ c) All angles are 90*	Tetragonal
(a = b ≠ c) Two angles are 90, one angles is 60 or 120*	Hexagonal
(a ≠ b ≠ c) All angles are 90*	Orthorhombic
(a ≠ b ≠ c) Two axes are 90* and one isn't	Monoclinic
(a ≠ b ≠ c) No angles are 90*	Triclinic

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