BELL SYSTEM TECHNICAL JOURNAL 



TRICLINIC SYSTEM 



/ 

 I X 



FIG. I 

 ASYMMETRIC 



FIG. 2 

 PINACOIDAL 



MONOCLINIC SYSTEM 



FIG. 3 

 SPHENOIDAL 



ORTHORHOMBIC SYSTEM 



» O I X » 



FIG. 6 

 BiSPHENOIDAL 



FIG. 7 

 PYRAMIDAL 



FIG. 8 

 BIPYRAMIDAL 



TETRAGONAL SYSTEM 



O \ 



^ 



FIG. 9 



BISPHENOIDAL 



FIG. 10 

 PYRAMIDAL 



FIG. II 

 SCALENOHEDRAL 



FIG. 12 

 TRAPEZOHEDRAL 



FIG. 13 

 BIPYRAMIDAL 



FIG. 14 



DITETRAGONAL 



PYRAMIDAL 



FIG. 15 

 DITETRAGONAL 

 BIPYRAMIDAL 



Figs. 1-15 — Crystal classes. 



