单斜晶系 Monoclinic crystal system
（重定向自Monoclinic symmetry）
![](/Images/godic/202501/28/Monoclinic.svg0108.png")
![](/Images/godic/202501/28/Monoclinic-base-centered.svg0108.png")
![El mineral Ortoclasa es un ejemplo de cristales monoclínicos.](/Images/godic/202501/28/Ortoclasio0108.jpg")
![Exemple de minéral monoclinique : la biotite.](/Images/godic/202501/28/MeroxeneSomma0108.png")
单斜晶系无高次对称轴，二次对称轴和对称面都不多于一个。晶体以唯一一个二次轴或对称面法线为b轴。b轴和a轴、c轴均正交，a轴，c轴斜交。α=γ=90，β≠90；a≠b≠c。折射率有3个，其中仅有一个主折射率方向和b轴重合。
| 单斜晶系 | 简单单斜 | 底心单斜 |
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Monoclinic symmetry
中文百科
英语百科
Monoclinic crystal system 单斜晶系
（重定向自Monoclinic symmetry）
In crystallography, the monoclinic crystal system is one of the seven lattice point groups. A crystal system is described by three vectors. In the monoclinic system, the crystal is described by vectors of unequal lengths, as in the orthorhombic system. They form a rectangular prism with a parallelogram as its base. Hence two vectors are perpendicular (meet at right angles), while the third vector meets the other two at an angle other than 90°.
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