48 E. F. PITTMAN. 
By E. F. Prrrman, a.R.s.M., Government Geologist, Sydney. 
[Read before the Royal Society of N. 8.. Wales, June 5, 1895 } 
Ix November 1893, a new mineral named Willyamite from the 
Australian Broken Hill Consols Mine was described at a meeting : 
of this Society, and the following notes relate to two new mineral : 
substances, which are somewhat remarkable in their composition, — 
and which are from the same interesting mine, having been for — 
warded to me by Mr. Geo. Smith, the General Manager. Although 
both these substances differ materially from anything hitherto — 
described, neither of them is regarded as a distinct mineral species. ‘ 
They appear to be merely mineral mixtures and may be described 
as alteration products, the one having evidently been derived — 
from the mineral dyscrasite and the other from argentiferous : 
galena. 
I.—The first substance was found at a depth of from one hundred 
to one hundred and forty feet (vertical) in a limonite gangue and 
was associated with stromeyerite, bindheimite, volgerite, and 
azurite. One specimen found by Mr. Smith was encasing a kernel of 
dyscrasite. The substance is massive, the colour is greyish-brows 
but when a surface is cut and polished on a lapidary’s wheel, OF 
when a thin section is examined under the microscope it is see? 
to have a finely banded structure, the bands having a somewhat 
metallic lustre. The substance is sectile. The specific gravity 
of the specimen on the table is 4-9. Two analyses of the substance 
were made in the Geological Survey Laboratory, No. 1 being bY — 
Mr. J. C. H. Mingaye, r.cs., and the’ other by Mr, Harold P- : 
White, F.c.s. a 
: 
Norres on two New MINERAL SUBSTANCES rrom THE 
AUSTRALIAN BROKEN HILL CONSOLS MINE. 
: 
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