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An example of the triclinic crystals, microcline


Triclinic (a ≠ b ≠ c and α ≠ β ≠ γ )

In crystallography, the triclinic crystal system is one of the 7 crystal systems. A crystal system is described by three basis vectors. In the triclinic system, the crystal is described by vectors of unequal length, as in the orthorhombic system. In addition, all three vectors are not mutually orthogonal.

The triclinic lattice is the least symmetric of the 14 three-dimensional Bravais lattices. It has (itself) the minimum symmetry all lattices have: points of inversion at each lattice point and at 7 more points for each lattice point: at the midpoints of the edges and the faces, and at the center points. It is the only lattice type that itself has no mirror planes.

Triclinic crystal classes[]

The triclinic crystal system class names, examples, Schönflies notation, Hermann-Mauguin notation, point groups, International Tables for Crystallography space group number,[1] orbifold, type, and space groups are listed in the table below. There are a total 2 space groups.

# Point group Example Type Space group
Class Schönflies Intl orbifold Coxeter
1 Pedial [2] C1 1 11 [ ]+ Tantite enantiomorphic polar P1
2 Pinacoidal [2] Ci (= S2) Template:Overline 1x [2+,2+] Wollastonite centrosymmetric PTemplate:Overline

With each only one space group is associated. Pinacoidal is also known as triclinic normal. Pedial is also triclinic hemihedral

Mineral examples include plagioclase, microcline, rhodonite, turquoise, wollastonite and amblygonite, all in triclinic normal (Template:Overline).

See also[]


  1. Prince, E., ed (2006). International Tables for Crystallography. International Union of Crystallography. doi:10.1107/97809553602060000001 doi:10.1107/97809553602060000001. ISBN 978-1-4020-4969-9 ISBN 978-1-4020-4969-9. 
  2. 2.0 2.1 "The 32 crystal classes". Retrieved 2009-07-08. 
  • Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., pp. 64 – 65, ISBN 0-471-80580-7

Template:Crystal systems