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Each of seven categories of crystals (cubic, tetragonal, orthorhombic, trigonal, hexagonal, monoclinic, and triclinic) classified according to the possible relations of the crystal axes.
‘There are only fourteen distinct types of Bravais lattices, and these are associated with seven crystal systems.’
‘Fundamental text for each mineral includes such information as varieties and colors, crystal system and mineral group, composition, characteristic identifying features, size, and distribution.’
‘Each mineral is carefully assigned a ‘Dana’ number followed by the accepted name, chemical formula, crystal system, and space group.’
‘All of the forms in the isometric crystal system completely enclose space, making them regular geometric solids.’