16 MINERALS OF TASMANIA. 
somewhat large crystals, often the third of an inch in diameter, 
which are of a bluish colour and opalescent tarnish, in partially 
decomposed basalt at the Emu River ; commonly scattered as small 
blebs in black basalt, Table Cape; in large masses often inter- 
mixed with zeolitic matter, Sheffield. 
52. CHIASTOLITE (Silicate of Alumina). 
This is often classed as a variety of Andalusite, which is of the 
same composition. The common form has been obtained 
sparingly as knotted masses penetrating slate rock near its junction 
with the granite at Zeehan. 
53. CHRYSOTILE (Hydrated Silicate of Magnesia). 
Almost all of the locally termed Asbestus belong to this species, 
which usually occurs as seams and patches in Serpentine. 
Abundant near Beaconsfield and the Asbestus Range. The fibres 
are occasionally 10 to 12 inches in length, pale in colour, silky 
and beautifully soft to the touch. It is easily separable from the 
more compact rock. Samples occasionally occur that show a 
gradual transition to Hematite, with which it is closely associated ; 
at the Heazlewood it abounds in the Serpentine, but is short in 
fibre, and amianthus-like; about Mt. Heemskirk it occurs where- 
ever its parent rock exists, sometimes as short entangled masses 
of a white colour ; in more or less quantity at Mt. Claude, Pie- 
man River, Mt. Ramsay, the Penguin, Dundas, and it is said to 
occur east of the Mussel Roe River, N.E. Coast. 
54. CHRYSOCOLLA (Silicate of Copper). 
Usually occurs as a thin crust on other Copper minerals ; colour 
various, shades of emerald green, passing to pale blue. Obtained 
as a thin coating in small patches. 
Star of Peace Tin Mining Company, Cascade. 
5). COPPER, NATIVE. 
Is plentiful at several localities on the West Coast. At Mount 
Lyell and vicinity it is especially so, occurring in large and small 
arborescent masses, often reaching several pounds in weight. It 
is often found embedded in a clay or lithomargic magma, and 
sometimes attached to Limonite. 
Many assays have been made which show it to be auriferous, 
occasionally to a high degree; at Mount Bischoff a beautiful 
highly polished foil of extreme tenuity has been obtained, coating 
the cleavage planes of the killas or altered slate near its junction 
with the Porphyry rock; at the Montagu and Duck Rivers 
Native Copper has been obtained inirregular small lumps embedded 
in a nearly black basaltic rock; it occurs in a vein of Garnet 
rock at the Hampshire Hills; with Baryta at the Wilmot River ; 
as a flaky and frondose coating on Limonite and a silicious rock 
