374 CALIFORNIA ACADEMY OF SCIENCES. 



For Pyrite: 



a= coO oo (100) <xOi 



oo 2 c = — -g— r(4,0) 

 6= .(810) 



d = - — ^ - (780) 



For Albite: 



M = oo P oc (010) x = ,P, 55 (T01) 



P=0P (001) T = co 'P (1T0) 



v = P (Til) 2 = oo 'P 3 (T30) 



For Vivianite: 



b = oo P oo (010) v = P (Til) 



a = co P co (100) w=P oo(TOl) 



m = co P (110) it = 4 P 4 (ill) 

 * = 4 P co (301) 



