n.1.(Crystallog.) A kind of symmetry characteristic of certain crystals which from twinning, or other causes, come to resemble forms of a system other than that to which they belong, as the apparently hexagonal prisms of aragonite.
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where [[rho].sub.p] is a [rho] percentage of the electron density and u is the pseudo-symmetry vector.
The [R.sub.F] value corresponding to the traditional Le Bail extraction run ([R.sub.D]) and to the use of pseudo-symmetry information ([R.sub.PSEUD]), Patterson information ([R.sub.PATT]) and probabilistic estimate ([R.sub.PROB]) are given.
1) if pseudo-symmetry is revealed, and especially when the detected percentage is large, it is convenient to use it;