What is the orthorhombic crystal system ?

Orthorhombic crystal system : definition

The orthorhombic system (or rhombic) is a crystalline system whose unit cell is a right prism with a rectangular base. The three axes are of different lengths, but the 3 angles are equal to 90°. The characteristic element of the system is an axis of symmetry of order 2. It includes 3 crystalline classes. About 20% of minerals belong to this system, including andalusite, staurolite, aragonite, cordierite, barite, olivine, sulphur, etc...

Certain orthorhombic unit cell can be pseudocubic, pseudoquadratic or pseudohexagonal due to the bringing together of the parameters of the orthorhombic mesh with those of the latter.

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