- Crystal | Definition, Types, Structure, Facts | Britannica
Crystal, any solid material in which the component atoms are arranged in a definite pattern and whose surface regularity reflects its internal symmetry Crystals are classified in general categories, such as insulators, metals, semiconductors, and molecular solids
- All Crystals - The Crystal Council
The big page of crystals Read in-depth descriptions, planets, zodiacs, healing properties and more with each crystal Detailed crystal properties
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