minI';rai,0(;i('ai, notes — .\n'i>krson. 



205 



Mt. Stewart, lu'iir Ijeadville, N.S.Wales. 



(PI. x-I., Hgs. .S, \:) 



On two of the specimens of pyiite (see below) presented by Mi-. Combe 

 are some small, transparent, well-formed crystals of auglesite, wliicli occar 

 in nests in tlie sphalerite, mostly associated with, and in one case inter- 

 grown with, quartz. The faces of the measured crystal are smooth and 

 give splendid reflections, with the exception of one, which occurs twice, 

 and is vicinal to the base in the zone (100:001); the values obtained for 

 p of this face were 7° 21' and 6° 41', average 7° 1'. The crystals are 

 tabular on the base, which is the largest face. 



Forms and angles : — 



PYRITE. 



Mt. Stewart, near Leadville, N.S.Wales. 



(PI. xxxix., fig. 7.) 



Finely crystallised pyrite occurs at this mine. A magnificent example, 

 a block 18 X 14 inches and consisting principally of perfect cubes measuring 

 up to Ij inches along the edge, has been figured by Mr. G. W. Caj'd.'*^ 

 The mineral is argentiferous, and contains about foui' pounds of bismuth 

 to the ton ; it is used in the manufacture of sulphuric acid. 



A fine series of the characteristic minerals occurring at Mt. Stewart 

 has been presented to the Museum collection by Mr. A. Combe. One 

 large specimen consists entirely of pyrite, tlie crystals ci'owded together 



4 Card— Eec. Gaol. Surv. N.S.Wales, III., 1893, p. 125 (figd.) ; Handbook Min. 

 and Geol. Museum, Sydney, pi. iv. (Sydney, Dept. Mines, 1902). 



