• A crystal is a substance in which the particles are arranged in an orderly, repeating, three-dimensional pattern.
  • Different arrangements of the particles within a crystal cause them to adopt several different shapes.
  • A crystal is defined by its faces, which intersect with one another at specific angles, which are characteristic of the given substance.
  • Each of the seven crystal systems differs in terms of the angles between the faces and in the number of edges of equal length on each face.
  • The seven crystal system are shown below, along with an example of each.
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