0. C. Farrington — Azurite from Arizona. 



307 



In conclusion, the writer desires to acknowledge with thanks, 

 the kindness of those who have furnished him with material 



Table II. — Angles on basal plane, c (001). 



Calculated. 



Measured. 



m, 

 I, 

 /■ 

 P- 

 Q, 

 h, 



y, 



e, 



o. 



&, 

 x, 

 Js, 



a, 



o. 



110 

 023 

 011 

 021 

 223 

 221 

 121 

 245 

 241 

 447 

 111 

 221 

 100 

 101 

 207 

 101 

 302 



Farrington. 



88° 11' 



30 33 



41 31 



60 33 



41 



68 

 (33 



24 



14 



2 



39 50 



77 



38 



26 



33 

 54 53 

 71 26 

 87 37 

 44 44 

 16 38 

 47 12 

 58 53 



Schrauf. Crystal No. 1. Crystal No. 2. 



88° 10-3' 88° 10' 



30 24 



41 21 



60 24 60 29 



41 2i 41 22 



68 12 68 10 



62 56-5 



39 44 39 46 



77 23-5 77 24 



38 31 38 34 



54 50-5 54 51 



71 25-5 71 27 



87 36 



44 46 



40 

 15 

 56"5 



44 41 

 16 36 

 47 9 



30 



41 



41 



GS 

 03 



60 30 



20 

 9 

 3 



39 46 



77 26 



38 33 



54 47 



87 38 



44 41 



47 13 



Other meas- 

 urements. 



8S C 



68 13 



87 36 

 44 42 



58 54 





Table III. 



— Angles on 



the orthopinacoid, a (100) and 



a f (100). 









Calculated. 



Measured. 



Other 

 urem 







Farrington. 



Schrauf. 



Crystal No. 1. Crystal No. 2. 



ents. 



W, 



110 

 120 

 023 

 011 

 021 

 101 

 223 

 ' 221 

 121 



111 

 221 

 321 

 12-10-5 

 207 

 01 

 302 



40° 34' 

 59 43 



87 56 



88 12 

 88 50 



42 53 

 57 47 



43 56 

 62 7 



53 22 

 45 5 

 33 35 

 39 48 

 75 45 

 45 12 

 33 30 



40° 21' 

 59 41 



87 55-8 



88 12 

 88 49 



42 50 

 57 42 



43 45-5 

 61 58 



53 15-5 



44 55 

 33 26 

 39 37 

 75 44 



45 9 

 33 27-5 



40° 34' 



40° 



33' 



40° 

 60 



30' 

 17 



/, 



P, 

 o, 



h, 



87 



56 

 16 

 50 

 57 

 50 

 58 

 12 



18 





88 



88 52 88 











42 46 

 57 40 



43 50 



53 31 



45 19 



75"~56 

 45 20 



42 

 57 

 43 

 62 



53 



42 



56 





7, 







h 



... 





£, 







33 

 39 

 75 



30 



F, 





55 





47 



e, 



45 



12 





V, 



33 



29 







for the work, and the valuable assistance and advice which 

 have been generously rendered him by Prof. S. L. Penheld. 



Mineralogical Laboratory of the Sheffield Scientific School, June, 1890. 



Am. Jotjr. Sci. — Third Series, Vol. XLI, No. 244. — April, 1891. 

 20 



