46 CATALOGUE OF MINERALS ; 
thirty miles to the west of Mackay, where large blocks of % ewt. 
to 1 cwt. have been obtained (Staiger). At Mount Ophir, 
Chowey Creek, a good deal of molybdenite occurs, with iron 
pyrites in an auriferous quartz. In the old Chowey reefs, about 
five miles up Chowey Creek, nearly due N. of Didcot, molybdenite 
with specks of gold in its midst is found in quartz. 
All the specimens I have seen of this mineral are in scales, 
foliated, or massive, none helping to determine the crystallographic 
system under which molybdenite should be classed. 
ARGENTITE—Comp. Ag S. 
In the Cumnor Lease, Silverfield, Tinaroo district, an argen- 
tiferous galena occurs, assaying as high as 1,400 ozs. of silver to 
the ton. It is probable that a good deal of this silver is distributed 
through the galena in the form of free sulphide. 
The Target mine, in the same district, containing yellow oxide 
and grey carbonate of lead and galena, is said to have yielded 
some argentite. 
GaLENA—Comp. Pb S, but containing silver, gold, and other 
metals. 
Galena is a widely spread mineral in Queensland. It has been 
found at Normanton; on the Dugald; Yarrol, in the Burnett 
district; and in the Kennedy district. It occurs with cassiterite 
in quartz at the Louisa Herberton, and with stibnite—an unusual 
association—in the Cumnor lease, Silverfield, Tinaroo district. 
Galena is frequently argentiferous and sometimes auriferous, I 
mean in paying quantities, for it is proved that all galenas contain 
more or less silver, and probably gold in small quantity. From 
the Argentine (Star River) silverfield, a galena assayed 79°5 per 
cent. of lead and 107 ozs. of silver to the ton, and a galena with 
pyrites and zinc-blende assayed 60 per cent. of lead and 69 ozs. 
of silver to the ton (Jack). A galena from Cannibal Creek, 
Maytown, assays 60 ozs. of silver per ton; from Newelltown speci- 
mens assay 78 per cent. of lead and 200 ozs. of silver per ton; 
from Gilberton a galena assays 155 ozs. of silver per ton, and one 
from the Etheridge district assays gold 4 ozs., and silver 84 ozs. 
per ton, and 54 per cent. of lead. In the Potosi lode to the W. 
of Mungai near Mount Perry, argentiferous galena is associated 
with iron and copper pyrites and a little sphalerite in a gangue of 
quartz and heavy spar (barytes). From Silverfield and from 
