M I N K K A l,()i ; I r A I. NOT KS A N 1 1 K liSi tN . 



211 



l^orius and auyles: — 



AZURTTE. 



Cobar, N.S.Wales. 



(PI. xli., fig. 5.) 



In Inspector G. Smith's collection there ai^e a number of specimens 

 of azurite from the Cobar Grladstone Mine, which he kindly placed at my 

 disposal for description. On some of the hand specimens the crystals are 

 large, coarse, and quite unsuitable for measurement, but others carry 

 small crystals, two of which were detached and measured. On account 

 of their softness and crowded condition it was not easy to obtain crystals 

 adapted for the goniometer. The mati-ix is a mixture of sulphides and 

 oxides of copper and iron. 



The crystals are elongated parallel to the h axis and tabular on the 

 basal plane, the largest faces belonging to c (001), B (241), h (221), and 

 a (101) ; on one crystal narrow faces of the unit prism vt. (HO) were 

 found. The faces in the zone [100:001] are striated parallel to their 

 intersections, and between c and $ (101) is a rounded area which gave an 

 almost continuous series of signals which could not be assigned to definite 

 forms. A similar area was found on the azurite of Mineral Hill, Condo- 

 bolin, N. S. Wales. 15 



For measurement the crystals were mounted with the zone [100:001] 

 equatorial, which would make the b pinacoid (not present) the polar plane, 

 and in the table (^', p', are the co-ordinate angles for this position, the 

 angles (^, p, for the normal position being placed alongside. The angles are 

 calculated from the elements obtained for the Mineral Hill azurite.^^ 



15 Anderson— Jour. Roy. Soc. N.S.Wales, li., 1917, pp. 278-279. 

 18 Anderson — Loc. cit., pp. 281-284. 



