194 



University of California . 



[Vol. 3. 



The following table shows the measurements together with 

 the calculated angles for these forms. 



No. 





Symbol. 



Measured. 



Calculated. 



J 



Gdt. 



Miller. 



T 



p 



r 





a 



r 



1 



a 



Ooo 



100 



o°oo' 



90°00' 



0°00' 



90°00' 



o 



d 



00 



110 



44 54 





45 



00 





3 



g 



ocf 



340 



37 01 





36 



52 





4 



e 



oo 2 



1 20 



26 30 





26 



34 



i i 



5 



h 



oo4 



140 



14 12 





14 



02 



L I 



6 







1 



111 



45 12 



54 45 



45 



00 



54 44 



7 



to 



1 1 



252 



(46 36 

 1 2(1 46 



29 31 

 71 24 



21 



48 



29 30 

 69 37 



8 



■11 



12 



121 



\ 44 45 

 126 28 



33 46 

 66 10 



45 

 26 



00 

 34 



35 16 

 65 54 



9 



t 



24 



241 



| 14 20 



64 52 



14 



02 



64 07 





1 26 15 



77 06 



26 



34 



77 23 











{23 45 



37 18 



26 



34 



36 42 



10 



s 



23 



231 



■! 18 38 



57 44 



18 



26 



57 41 











|33 46 



75 29 



33 



41 



74 30 



The combinations of forms on the measured crystals are shown 

 in the following table: 



%T' a d 8 e h o u> n t s 



1 a — — e — o — n — — 



2 a — — e h o — n — s 



3 a d 8 c li o tn ii f s 



4 a — — e — own t s 



5 a d $ e — o <o n — s 



Chemical Properties. — Chemical tests showed that the crystals 

 of pyrite contained no copper. The massive ore, however, gave 

 a reaction for copper, which probably comes from the admixed 

 chalcopyrite. Other elements, such as arsenic or thallium were 

 not tested for. 



CHALCOPYRITE. 



Some portions of the massive ore show a sulphide having the 

 color of chalcopyrite and affording a qualitative test for copper. 

 No crystals of chalcopyrite were met with ; neither were any large 

 masses of pure chalcopyrite found. 



