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Crystals of the triclinic system are referred to three unequal axes, all of which intersect at oblique angles. None of the axes are perpendicular to any other axis.

Crystals of the triclinic system may be said to possess only a 1-fold symmetry axis, which is equivalent to possessing no symmetry at all. Crystals of this system possess no mirror planes. The holomorphic class demonstrates a center of inversion symmetry.

Mineral species of the triclinic class include plagioclase and axinite; these species tend to be of tabular habit.

  • The three crystallographic axes are of unequal lengths that make oblique angles to each other.
  • 1-fold symmetry axis as their only symmetry.

 

 
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