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the free encyclopedia
In
crystallography, the
triclinic
crystal system is one of the 7
lattice
point groups. 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.
The
point groups that fall under
this crystal system are listed
below, followed by their
representations in international
notation and
Schoenflies notation.
| name |
international |
Schoenflies |
| triclinic normal |
 |
Ci (also
denoted by S2) |
| triclinic hemihedral |
1 |
C1 |
With each only one space group
is associated.
