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Define crystal
Short answer
A crystal is a homogeneous solid with a regular, repeating three-dimensional internal atomic arrangement, bounded by naturally smooth plane faces meeting at fixed angles according to geometric laws. Example: quartz.
Define crystal.
A crystal is a homogeneous solid body of a chemical element or compound whose atoms, ions or molecules are arranged in a regular, repeating three-dimensional pattern (space lattice), and which is bounded by natural, smooth plane faces that follow geometric rules. Examples: quartz, calcite, halite (common salt).
Features:
- Definite internal atomic arrangement.
- Flat faces meeting at fixed angles (law of constancy of interfacial angles).
- Definite symmetry and a definite chemical composition.
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