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Fascinating facts about crystals
Three illustrated crystals are shown to demonstrate different crystal classes and symmetries: a tall, prismatic monoclinic gypsum crystal; a pointed, double-ended tetragonal wulfenite crystal; and a cubic isometric halite crystal, each labeled with its crystal class and symmetry content. Diagram showing the seven primitive crystal systems with labeled 3D shapes: isometric (cubic), tetragonal, orthorhombic, hexagonal, triclinic, monoclinic, and rhombohedral (trigonal), each with axis orientation and a brief description of their geometric properties.
Animated snowflake against a dark background.
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Fascinating facts about crystals
Discover five facts about crystals.
Video: © American Chemical Society (A Britannica Publishing Partner)
How Do Snowflakes Form?
A snowflake starts as a dust grain floating in a cloud.
Video: © American Chemical Society (A Britannica Publishing Partner)

Images

examples of well-shaped crystals
Each of these examples of well-shaped crystals belongs to a different crystal class...
Encyclopædia Britannica, Inc.
crystal systems
The seven primitive crystal systems.
Encyclopædia Britannica, Inc.
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