MATHEMATICS OF PHYSICAL PROPERTIES OF CRYSTALS 



TRIGONAL SYSTEM 



m 



FIG. 16 

 PYRAMIDAL 



FIG. 17 

 RHOMBOHEDRAL 





FIG. 18 

 TRAPEZOHEDRAL 



FIG. 19 

 BIPYRAMIDAL 



FIG. 20 

 DITRIGONAL 

 PYRAMIDAL 



FIG. 21 



DITRIGONAL 



SCALENOHEDRAL 



FIG. 22 

 DITRIGONAL 

 BIPYRAMIDAL 



FIG 23 

 PYRAMIDAL 



HEXAGONAL SYSTEM 



FIG. 24 

 TRAPEZOHEDRAL 



FIG. 26 

 Dl HEXAGONAL PYRAMIDAL 



FIG. 25 

 BIPYRAMIDAL 



FIG. 27 

 DIHEXAGONAL BIPYRAMIDAL 



\ o'^OIx^x / 



FIG. 28 



TETRAHEDRAL- 



PENTAGONAL- 



DODECAHEDRAL 



CUBIC SYSTEM 



FIG. 29 



PENTAGONAL 



ICOSITETRAHEDRAL 



FIG. 30 



DYAKIS 



DODECAHEDRAL 



FIG.3I 

 HEXAKIS-TETRAHEDRAL 



FIG, 32 

 HEXAKIS- OCTAHEDRAL 



Figs. 16-32 — Crystal classes. 



