4 PLUTONIC ROCKS.—OASE I. 
PLUTONIC ROCKS. 
Case I. 
GRANITIC ROCKS. 
*l. COARSE-GRAINED, TERNARY 
GRANITE. Map No. Ra 38. 
Near the top of Mount Tarran- 
gower. } sheet 14 S.W. 
Occurs in the Silurian rocks; in 
places it has the a ie 
granite. ppearance of graphic 
2. BINARY Granire. 
Map No. Mb 43. 
Hughes’s Tunnel (No. 3), Coliban 
Water Supply Contract, Mount 
Alexander, 4 sheet 13 N.W. 
The embedded crystals of felspar 
(orthoclase) are h isti 
ere scen distinctly. 
It also contains nests of tale. 4 
2A. BINARY QRANITE. 
Map No. Rd 26. 
Staughton’s “Run, near Anakie 
Hills, 4 sheet 19 N.E. 
2 
2B. CRYSTAL or FELSPAR. 
fc List No. Rd 27, 
stany ah paral of Lara, near 
uck 
arent onds Creek. 1 sheet 
Fine-grained Srani 
amount of tie eat with a large 
* 
9. Ferspar Crystat (Ortho- 
ase), Map No, Mb 42. 
Same locality as No, 2, 
Thes S 
small ape occur in a series of 
x es, runnin 
cut 2 g across the open 
ting, 60 feet from south endof ae 
` 4 
4. Binary GRANITE. 
Secti pe NO Be de: 
ton 10, 3 
4 sheet NW pa 
Forms a dyke in 
crystals of orthoc] granite. Large twin 
ase, 
5. TOURMALINE CrysTALs. 
Map No. Mb 33. 
East foot of Mount Alexander, 
below highest point. sheet 13 
N.W. 
Occurs in long radiating, prismatic 
crystals. 
6. Decomrosep Granite (Kao- 
lin or China Clay). 
Map No. R 2. 
Deep Creek, township of Bulla, 
4 sheet 7 S.E. 
A company was formed in 1861 to 
work this deposit for exportation ; but 
as the value of the best kaolin is only 
18s. per ton, the enterprise was not suc- 
cessful, and had to be abandoned. It 
occurs in large quantity, and will doubt- 
less be valuable when a local china 
manufacture is established, 
*7, STEATITE (Variety of). 
Map No. Mb 39. 
Same locality as Nos. 2 and 3. 
Hydrated silicate of magnesia and 
alumina. It occurs as a vein in a red 
ternary granite, 396 feet from north end, 
of tunnel, 
*8. Hyprous SILICATE or ALU- 
MINA AND MAGNESIA. 
Same locality as last, 
Occurs as a vein, 422 feet from north 
end of tunnel, It is colored green pro- 
bably by oxide of iron, 
9. COARSE, TERNARY GRANITE. 
List No. R ($R 
Pyramid Hill. 
Those marked with an * occur as dykes (Elvans). 
