£18 Pogue and Goldschmidt— Quartz from Alexander Co. 



w. = +50 with I good face, 4>p = 0°02' 

 6 = + V."o with 2 good faces, <pp = oil 



08 

 6. = —ty-0 with 3 good faces, <f> P = 03 



04 



04 

 77: = +10 with 2 good faces, <f>p ~- 21 



04 

 n: = +V-1 with 1 good face, cpp = 13 03 

 n. = — -V-1 with 1 good face, <£p = 12 53 



A discussion of the new forms according to their number 

 series* follows : 



For w. = + -jo we have the zone section : 



ured 



Calculated 



72°53' 



0°00' ; 72°31' 



76 24 



00 ; 76 42 



76 44 





76 47 



00 ; 76 42 



76 46 





76 54 





77 11 



. 00 ; 77 19 



77 11 





78 32 



12 44 ; 78 40 



78 44 



12 44 ; 78 40 



Letter. 





i 



h 





w. 



fir 



Symb. 



pq = 10 

 p—l = 



5 



2 

 3 



20 

 1 



(fl>) 



(1) 



50 



30 

 2 





-^-= 



2 — v 



1 



1 



(2) 



3 



GO 



+ -§-0 passes well in the series, 

 expected. 



+ ^0, not yet noted, is to be 



= +-V-0 and r}'. = +£0 belong to the zone section 



D 



+ -V-0 

 3 

 4 



= t. 1 3 



Letter g 



Symbol pq =. + 30 

 p — :}= 



9 



+-V-0 



+ 10 

 1 



f 



+ 40 

 1 



w 



1— V 



+-F" an< ^ +1^ therefore hold a proper place in the series. 



For 6. = — s^-0, the following relations appear : 



Letter... d T 6. ,/ C, 



Symbol pq — 

 3-p = 

 v 



■30 











2. 



1 



2 



on 



3~~ u 



j_ 



3 



-JO -40 



i 1 



The new form —-£-0 is in accord with the series, which, 

 however, is not the case with — - 2 T 3 -0. The latter was given by 

 Des Cloizeauxf as eH, and by Rath;): as — - 2 T -R. Their measure- 

 ments, however, agree rather with — -^-0, as the following tabu- 

 lation will show : 



*For explanation of such a discussion consult Zeitschr. Kryst., vol. xxviii, 

 pp. 1-35 ; 414-451, 1897. 



f Mem. sur la cryst. et la struct, int. du Quartz. Paris, 1858. Pp. 418- 

 432; 528. 



:£ Zeitschr. Krysfc., vol. x, p. 159, 1885. 



