ART. 18 MINERALS OF ITALIAN MOUNTAIN CROSS AND SHANNON 17 



lower end is not twinned and, as shown in the drawing, has a dis- 

 tinctly different habit from the twinned end. The angles measured 

 in two settings of both ends of this crystal are given in the 

 following table : 



Angles of diopside crystal, Figure 3 



Many of the crystals of specimens of this type are simple in habit 

 and, in a few measured, these are very poor in forms. A typical 



Pigs. 4-5. — 4, Diopsidb Crystal. Twinned on (100). 6, Sahlitb Cbystal 



one showing as a prominent form a new positive pyramid (661) is 

 shown in the drawing, Figure 2. This crystal gave the angles as 

 illustrated above. 

 48180—27 3 



