What is the crystal system in mineralogy ?

Crystal system : definition

The inventory of the elements of symmetry possessed by the mineral species has made it possible to group it into 7 crystalline systems : cubic, tetragonal, hexagonal, rhombohedral, orthorhombic, monoclinic and triclinic.

Each system is defined by a fundamental polyhedron corresponding to the simplest form possessing all the symmetry elements of the system.

Note that the Anglo-Saxons only recognize 6 crystal systems, considering the rhombohedral system as a special case of the hexagonal system.

Cubic

Tetragonal

Orthorhombic

Triclinic

Hexagonal

Rhombohedral

Monoclinic

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