0. C. Farrington — Azurite from Arizona. 



303 









Meas. 





Calc. 



G /sm, 





321.. 110, 



18° 36' 





18° 53' 



G~6, 





321 * 101, 



38° 51' 





38° 45' 



G a a', 





321*100, 



33° 30' 





33° 35' 



G^h, 





321 ^ 111, 



102° 17' 





102° 29' 



a^ain, 



accui 



•ate measurem 



ents could 



not 



be obta 



Here 



since, owing to striations and oscillatory combinations, the 

 reflections of the signal were always an unbroken band of from 

 1° to 4° in length. The measurements given were taken as 

 nearly as possible from the middle of these bands. The form 

 G occurs as a more or less rounded truncation of the edge mO. 

 It is interesting to note that in the Chessy azurites, according 

 to Schrauf, a like truncation of the edge between the hemi- 

 dome and prism occurs, but in this case in the negative quad- 

 rant, that is, the edge ma. 



Dome-like habit. Fig. 8. — All the crystals of this habit 

 were found on one specimen, associated with the new mineral 

 spangolite, which is supposed to have come from near Tomb- 

 stone, Arizona. They are all characterized by 

 being slightly lengthened out in the direction 

 of the clinodiagonal, and by the predominance 

 of the clinodome, Z, 023. Striations parallel 

 to the edge cl are common and serve for identi- 

 fying the faces. A habit similar to this, occur- 

 ring in the Chessy azurites, is figured by Levy.* 



Lath-like habit. Figs. 9 and 10. — Crystals of this habit 

 occur at the Longfellow Mine, Arizona, and all show the same 

 peculiarity of form, due to a lengthening out in the direction 



of the orthodiagonal and the remarkable development of the 

 orthodome d. Two crystals were selected as the most nearly 



* Atlas, PL 64, fig. 25 



