212 



C. D. SMITH AND L. A. COTTON. 



Crystal No. 3. — Few faces were present on this crystal. 

 Only one representative face of each of the forms c, fc, G, F 

 and f was observed. 



TABLE III. 



Face. 



Miller 

 Indices. 



Measured <h. 



E<£ 



Measured 



■p. 



Calcul- 

 ated. 



4> 



Calcul- 

 ated p. 



8<f>. 



/ 



8p. 







/ o / 



/ 



/ 



/ 





/ 



i 



C 



001 





3 







1 



— 







_ 







c' 



001 





i 



14 



1 



- 







- 



14 



k 



1 17 



+44 40 



- 



16 42 



- 



45° 



17 10 



20 



28 



# 



1 17 



-43 27 



- 



18 1 



- 



„ 



tl 



1 33 



51 



#g 



1 16 



-43 47 



- 



18 58 



- 





, 



19 49 



1 13 



51 



tt 



I 16 



+44 4 



- 



18 59 



- 





, 





56 



50 



a 



2 2 IL 



-44 43 



- 



21 26 







, 



21 28 



17 



2 



F 



3 3 16 



-44 39 



- 



22 15 







, 



22 5 



21 



10 



f 



1 15 



+44 40 



1 



23 47 



* 





, 



23 23 



20 



24 



# w 



22 5 



-43 45 



1 



40 52 



1 





, 



40 51 



1 15 



1 



Crystal No. 4. — This was the only crystal measured on 

 which the form f was not present. The dominant faces are 

 c and I, 



TABLE IV. 



Face. 



Miller 

 Indices. 



Measured <7). 



E<£. 



Measured 



v 



Calcul 



ated 



Calcul- 

 ated p. 



8<f>. 



8p. 







o / o / 



1 



o / 



/ 





O 1 



, 



O 1 



C 



001 



- 



1 



2 







2 



- 







- 







C' 



001 



- 



1 



2 



11 



- 



- 







- 



11 



*T 



013 



1 4 



- 



28 17 



1 

 2 







27 1 



1 4 



1 16 



s 



1 1 10 



+45 50 



- 



11 43 



- 



45° 



12 12 



50 



29 



1 



118 



-44 28 



- 



14 25 



- 



>> 



15 7 



32 



42 



] 





-44 56 



- 



14 54 



1 



» 



M 



4 



13 



1 





-44 56 



- 



15 39 



1 



.t 





4 



32 



1 



fi 



-44 56 



- 



16 2 



1 



>t 





4 



55 



d 



114 



-44 1 



— 



28 30 



- 



,, 



28 23 



59 



7 



f , 



, , 



+45 



\ 



28 41 



- 



y, 



j? 







18 



D 



6 6 23 



-45 18 



~ 



29 10 



2 



>> 



29 26 



18 | 



16 



