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Minerals of the orthorhombic crystal system are referred to three mutually perpendicular axes, each of which is of a different length than the others.

Crystals of this system uniformly possess three 2-fold rotation axes and/or three mirror planes. The holomorphic class demonstrates three 2-fold symmetry axes and three mirror planes as well as a center of inversion. Other classes may demonstrate three 2-fold axes of rotation or one 2-fold rotation axis and two mirror planes.

Species which belong to the orthorhombic system are olivine, hemimorphite and barite. Crystals of this system tend to be of prismatic, tabular, or acicular habit.

  • 3 crystallographic axes of unequal length that make angles of 90° with each other
  • Three 2-fold symmetry axes.

 

 
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