from the GNU version of the Collaborative International Dictionary of English
- n. 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.
from The Century Dictionary and Cyclopedia
- n. In crystallography, false symmetry; the appearance of having a higher degree of symmetry than is actually the case, usually produced through twinning. See twin.
- n. A crystal exhibiting pseudosymmetry is often named according to the system of symmetry which it imitates (through twinning, distortion, etc.) as follows: pseudisometric, pseudotetragonal, pseudohexagonal, pseudorhvmbohedral or pseudotrigonal, pseudo-orthorhombic, pseudomonoclinic, etc.; for example, complex twins of phillipsite sometimes resemble isometric dodecahedrons and are hence said to be pseud-isometric; also, isometric crystals (as of gold, silver, and copper) by symmetrical distortion, that is, by flattening or elongation in the direction of an octahedral (trigonal) axis, are often strikingly pseudorhombohedral.
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