Crystalline family

The crystalline family indicates a whole of crystal lattices characterized by same properties of Symétrie; it is frequently used for the classification of the crystals.

Families of the networks with 2 and 3 dimensions

The two-dimensional networks are divided into four crystalline families:

  • monoclinical ( m );
  • orthorhombic ( O );
  • tétragonale or quadratic ( T ) ;
  • hexagonal ( H ).

The three-dimensional networks include/understand two additional crystalline families, in addition to the four preceding ones:

  • triclinic or anorthic ( has );
  • cubic ( C ).

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