Monoclinic crystal system
From Wikipedia, the free encyclopedia
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.
Simple monoclinic |
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.
| Name | International | Schoenflies | Example |
|---|---|---|---|
| monoclinic normal | <math>\frac2m</math> | C2h | gypsum |
| monoclinic hemimorphic | <math>2</math> | C2 | |
| monoclinic hemihedral | <math>m</math> | C1h | sucrose |
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
The four monoclinic hemihedral space groups include:
- 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 planesde:Monoklines Kristallsystem
et:Monokliinne süngoonia fr:Monoclinique ko:단사정계 pl:Układ jednoskośny ru:Моноклинная сингония sk:Monoklinická sústava zh:单斜晶系
