286 



(J. ANDERSON. 



Angles on a (100). 



Form. 



Anderson. 



Farrington. 



o / 



57 48 



Schrauf. 



P (223) 



o 



57 



47 



57 42 



I (023) 

 s (111) 



87 

 51 



55 



8 



87 

 51 



56 



8 



87 56 

 51 1 



/ (OH) 

 h (221) 



88 

 43 



11 



56 



88 

 43 



12 

 56 



88 12 

 43 451 



7 (121) 

 p (021) 



62 



88 



7 

 49 



62 



88 



7 

 50 



61 58 

 88 49 



k (221) 



134 



53 



134 



55 



135 5 



X (2-18-3) 



96 



50 



96 



50 



96 53 



R (241) 



118 



50 



118 



51 



119 2 



X(481) 



119 



46 



119 



47 



119 59 



Summary. 

 Fine crystals of azurite, accompanied by cerussite and 

 malachite occur in the oxidised zone of the Iodide Mine, 

 Mineral Hill, near Oondobolin, New South Wales. A total 

 of twenty-one forms of which X (481) is new, were found 

 on the crystals, which are characterised by two different 

 habits. The measured angles are not in agreement with 

 the standard values as given by Schrauf, and new elements 



a : b : c = '85721 : 1 : '88581, fi = 87° 34Jf 

 have been calculated. When comparison is made between 

 Schrauf's elements for the azurite of Chessy and those 

 derived by others for the azurite from various localities, it 

 is found that Schrauf's a and c axes are distinctly shorter. 



Description of Plates. 

 Plate V. 



1. Crystal 5; orthographic projection on the plane of the a 

 and b axes, crystal shown in its actual development. 



2. Crystal 5; orthographic projection of Fig. 1 on the plane 

 of the a and c axes. 



3. Crystal 5; Fig. 2 idealised. 



Fig. 4. Crystal 2; orthographic projection on the plane of the a 

 and c axes, ideal. 



Fig 



Fi< 



Fif 



