I have seen in some books that the triclinic bravais lattice ( a≠b≠c , α≠β≠γ ) excludes explicitly the option that one angle equal 90°. For instance 90°≠α≠β≠γ=90°.(adsbygoogle = window.adsbygoogle || []).push({});

If I got the definition of α, β and γ correctly, it would be a primitive cell with a pair of parallel faces as rectangles, and rhoumbuses in the other two pairs.

The question is: Why this lattice is not included in the bravais lattices? Is possible to redefine the vectors, such that they turn into one of the Bravais lattices?

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# (Bravais?) lattice with one angle equal 90

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