正交晶系，也叫斜方晶系。该晶系特点是没高次对称轴，二次对称轴搭对称面总和弗少于三个。晶体以迭三个互相垂直个二次轴或对称面法线为结晶轴。α=β=γ=90o；a≠b≠c。非均质性强，具有三个弗同个主折射率。
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