F M JAEGER AND H. HAOA. ON THE SYMMETRY OF THE RöNTGEN-PATTERNS 

 OF RHOMBIC CRYSTALS. I. 



Fig. 5. 

 Arragonite. Plate parallel to (010). 



Fig. 6 

 Arragonite. Plate parallel to (001). 



:^'':<('^^^ 



Fig. 7. 

 Topaz. Plate parallel to (100). 



Fig. «. 

 Topoi. Plate parallel to (001). 



Proceedings of the Acad, of Sciences, Amsterdam. XVUI. A» 1915/1916. 



MELIOTVPE, VAN VEER.AMSTERD 



