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as many as 230 different crystalographic groups (in 3 dimensions).

I think that it maybe related to the fact that Bravais latices describe

different symetries of the set of points generated by a set of three discrete translations.

In general these point might have some internal structure which changes the symmetry group.

If we took into account the fact that at each point of Bravais lattice we can have a so

called base consisting of more then one atom, then this extended latice might have as many

as 230 different symmetry groups. Is this explanation resonable?