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Orthorhombics
edit"Perite is orthorhombic, which means crystallographically, it contains three axes of two of equal length (the bases a and b) and one of a little longer or shorter length. All three bases intersect at a 90° angles. It belongs to the space group Cmcm {C2/m 2/c 21/m}."
will be changed into
"Perite is orthorhombic, space group Cmcm {C2/m 2/c 21/m}."
The reasons are:
1) Crystal systems e.g. the orthorhombic are not defined by cell dimensions but by symmetry properties.
2) As a consequence of its symmetry properties the orthorhombic the three base axes of the unit cell are perpendicular but of different lengths, or rather the symmetry requirement do not lead to any requirements for the relation between the unit cell vectors other than being perpendicular. Two or even three may be approximately equal, they may even be equal within the limits of error.
3) This is not the place to explain the orthorhombic system, it is better to link to an article on this subject.