View source for Weiss parameters

<Font color="blue"> Paramètres de Weiss</Font> (''Fr''). <Font color="red"> Weiss-Parameter </Font> (''Ge''). <Font color="green"> Parámetros de Weiss</Font> (''Sp''). <Font color="brown"> Параметры Вайс </Font> (''Ru''). <Font color="black"> Parametri di Weiss</Font> (''It''). <Font color="purple"> ワイスパラメーター</Font> (''Ja'')


The '''Weiss parameters''', introduced by Christian Samuel Weiss in 1818, are the ancestors of the [[Miller indices]]. They give an approximate indication of a face orientation with respect to the crystallographic axes, and were used as a symbol for the face.

Weiss parameters are the reciprocal of Miller indices, each followed by the corresponding axis symbols.

'''Example'''. Weiss parameters 2a:3b:1c indicate that a face intercepts the '''a''' axis at twice the a<sub>o</sub> units and the '''b''' axis at three times b<sub>o</sub> units as it cuts the '''c''' axis in c<sub>o</sub> units. The first plane of the family to which this face belongs has intercepts at 1/3, 1/2 and 1/6 on '''a''', '''b''', and '''c''' respectively, so that the corresponding Miller indices are (326).

[[Category:History of crystallography]]
[[Category:Morphological crystallography]]