ABT. 11. NOTES ON STEPHANITE FROM MEXICO — SHANNON. 



Fig. 1.— Stephanite Crystal 1 Showing Actual Dkvblopment. 



The order of agreement between the measured and calculated 

 angles is very good for the pruicipal forms. The forms here given 

 as new are as follows: 



540 (|<»). This form was found once only as a moderately broad 

 face yielding an excellent signal on crystal 2, as shown in Figure 2. 

 Angles : 



Measured <^=63 44 p=90 00 



Calculated ." «^=63 17 p=90 00 



Difference <^= 27 p= 00 



