# Dictionary Definition

monoclinic adj : having three unequal crystal
axes with one oblique intersection; "monoclinic system" [ant:
triclinic]

# User Contributed Dictionary

## English

### Adjective

- Having three unequal axes with two perpendicular and one oblique intersections.

#### Translations

having three unequal axes

- Spanish: monoclínico

# Extensive Definition

In crystallography, the
monoclinic crystal
system is one of the 7 lattice point groups.
A crystal system is described by three vectors.
In the monoclinic system, the crystal is described by vectors
of unequal length, as in the orthorhombic system. They
form a rectangular prism
with a parallelogram as base.
Hence two pairs of vectors are perpendicular, while the third pair
make an angle other than 90°.

There exist two monoclinic Bravais
lattices: the simple monoclinic and the centered monoclinic
lattices, with layers with a rectangular and rhombic lattice,
respectively.

image:Monoclinic.svg|Simple monoclinic
image:Monoclinic-base-centered.svg|Centered monoclinic

The
crystal classes that fall under this crystal system are listed
below, followed by their representations in international notation
and Schoenflies
notation, and mineral examples.

The number of space groups
for each crystal class is 6, 3, and 4, respectively.

The three monoclinic hemimorphic space groups are
as follows:

- a prism with as cross-section wallpaper group p2
- ditto with screw axes instead of axes
- ditto with screw axes as well as axes, parallel, in between; in this case an additional translation vector is one half of a translation vector in the base plane plus one half of a perpendicular vector between the base planes

- those with pure reflection at the base of the prism and halfway
- those with glide planes instead of pure reflection planes; the glide is one half of a translation vector in the base plane
- those with both in between each other; in this case an additional translation vector is this glide plus one half of a perpendicular vector between the base planes.

## See also

## References

- Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., pp. 65 - 69, ISBN 0-471-80580-7

monoclinic in German: Monoklines
Kristallsystem

monoclinic in Estonian: Monokliinne
süngoonia

monoclinic in Spanish: Monoclínico

monoclinic in Esperanto: Monoklina
kristalsistemo

monoclinic in Basque: Kristal-sistema
monokliniko

monoclinic in French: Monoclinique

monoclinic in Korean: 단사정계

monoclinic in Latvian: Monoklīnā singonija

monoclinic in Polish: Układ jednoskośny

monoclinic in Portuguese: Monoclínico

monoclinic in Russian: Моноклинная
сингония

monoclinic in Slovak: Monoklinická sústava

monoclinic in Serbian: Моноклинична кристална
система

monoclinic in Serbo-Croatian: Monoklinična
kristalna sistema

monoclinic in Swedish: Monoklina
kristallsystemet

monoclinic in Ukrainian: Моноклінна
сингонія

monoclinic in Chinese: 单斜晶系