BY W. F. PETTERD. 5d 
width has been exposed at Mt. Lyell, which is stated to average 
4'5 per cent. of metallic Copper, 3 dwts. of Gold, and a small 
amount of Silver per ton of normal ore. On the surface this 
mass is altered to various forms of iron oxide. 
189. PYRRHOTITE (Magnetic Pyrites). 
Occurs as a large massive lode formation near George’s Bay; 
at Mount Ramsay in amphibole rock with native Bismuth and 
other minerals; in main adit at Mount Bischoff the samples 
weather to a bronze lustre; at Hampshire in amorphous masses 
which have a decided red tinge and also of a grey colour, dis- 
seminated in a hard metamorphic rock ; Penguin River, where it 
is highly nickeliferous ; Dundas, said also to carry Nickel; samples 
from the Blue Tier, near Beaconsfield, have been found to contain 
Nickel, and in the old adits the mineral has decomposed to a 
mixed sulphate of that metal and iron ; Beaconsfield, where it. is 
often auriferous ; Mount Pelion, in large masses. 
190. PYROXENE (Bisilicate of various bases). 
Abundant at the Upper Emu River; near the Whyte River it 
occurs sparingly. This species is identical with Augite, but the 
latter term is usually applied to the dark-coloured specimens, 
191. PENNITE (Hydro-nichel Magnesite). 
Occurs as a pale and somewhat dull incrustation on Chromite 
and Magnetite with Zaratite, from the latter it differs in containing 
Magnesia Carbonate. Heazlewood. 
192. QUARTZ (Silica). 
This abundant and widely diffused mineral is common both in 
the amorphous and crystallized form. The crystals occur as 
hexagonal prisms which sometimes have pyramidal terminations 
at both ends. It is found in many parts of the island, often in 
considerable abundance. The crystallized form more especially is 
met with in profusion in the tin-mining districts, where examples 
of large size, more or less waterworn, and showing a wide range 
of colouration, form one of the main features of the stanniferous 
drift. On Flinders Island and in the vicinity of Mount Cameron 
individual crystals weighing many pounds are commonly ootained ; 
they are known as “rock crystal,” and are beautiful representations 
of the species. In the auriferous districts the quartz is usually a 
more or less milky-white owing to enclosed vesicles, but extremely 
fine bunches of clear colourless crystals have been obtained at 
severallocalities. At the Heazlewood Quartz, often coloured green 
with the oxides of Chrome and Nickel, is an abundant admixture 
in the lode gangue of the Silver-lead mines, and on the West Coast 
erystals coloured red with Iron Oxide have been obtained. At 
Beaconsfield a honeycombed form occurs; this apparently 
