In his foreword to Structural Mineralogy. An classification was taken into account. The first Introduction (Lima-de-Faria, 1994) P.B. Moore classification of this type, which takes into con- emphasized that this book "is really not an end in sideration the distribution of bonds in a structure, itself. Rather it is a rallying call to urge further was that of silicates proposed by Machatschki clarification, representation and systematization (1928)...