78 VICTORIAN MINERALS.—CASE XIV. 
8a. ORTHOCLASE CRYSTALS 
(“ Baveno ” Twins). 
Three miles east of township “of 
Bradford, near Maldon. 
Occur in a patch of quartz in the 
granite. 
8. ORTHOCLASE (Potash-Felspat)- 
Hell’s Corner, Back Creek, Bayn- 
ton. 4 sheet 51 S.W. 
Y x tz 
: i bination with quarti, 
moan along the _bound- 
ine and mica, 
tourmalin at and Lower 
ary between the g 
Silurian rocks. 
Note.—Orthoclase forms on 
Tt also occurs in veins, €t 
}; Soda-Felspar). 
rA Map No. Ra 58. 
Blacksmith’s Gully Reef, Fryers- 
town. 4 sheet 15 N.E. 
Tn narrow veins and druses, associated 
with quartz. Several parts 0 e 
reef assume a porphyritic appearence 
from embedded crystals of iua, 7 
analysis, by the late Mr. C. S. Wood, 
gaye the following results :— 
Silica... ise AD 68:73 
Alumina on au 20°55 
Sesqui-oxide of iron «+ 0°20 
Lime .. ase ... trace 
Potassa ... TÒ ... trace 
Soda nI; To ... 10°43 
Dee 
99°91 
10, OrrGocasE (Soda-Spodumen). 
Map No. Md 31. 
Anahie Range. } sheet 19 N.E. 
Occurs in the newer basalt, associated 
with olivine and hornblende. 
An analysis, by the late Mr. C. 5. 
Wood, gave :— 

Silica ... ase ee» 64°22 
Alumina aot +++ 23°87 
Sesqui-oxide ofiron ... 13 
Lime ... des ... trace 
Magnesia eee ... 0°38 
Soda with some potassa 9°87 
99°87 

11. OLIGOCLASE. 
Mount Franklin, 4 sheet 15 S.E. 
In scoriaceous basalt, often associated 
with large masses of olivine. 
12. Frre-Cray 
Lal-Lal, near Ballarat. 
Occurs as a bed, 3 feet thick, covering 
a lignite deposit. It forms an excellent 
e of the principal constituents of granite. 
ther solid, or massively associated with quartz. 
fire-clay. The following is an analysis 
by the late Mr. C. S. Wood:— 
Insoluble silicate of alumina 92°60 
Soluble silicate of alumina 1°33 
Oxide of iron ... trace 
Soluble silica 0°53 
Water of constitution, driven 
off at red heat ... 
5°80 
soe 

100°26 

13. PHOLERITE. 
Blacksmith’s Gully Reef, Fryers- 
town. sheet 15 N.E. 
Occurs as soft, white, unctuous scales 
and coatings. Mr. Ulrich, of the Geo- 
logical Survey, states “That, at the 
above locality, it has evidently arisen 
from the decomposition of albite, which 
is always in close contact with it, and 
more or less of a soft, crumbling cha- 
racter.” According to an analysis, by 
the late Mr. C. S. Wood, its composition 
is as follows :— 


Silica ... tn see 44°92 
Alumina t ... 42°69 
Water ... ats: eee 12:79 
100°40 
14. Cray. 
Blacksmith’s Gully Reef, Fryers- 
town. i} sheet 15 N.E: 
The clay in which pholerite occurs. 
14a. SILICATE or ALUMINA and 
MAGNESIA. 
Lot 4, section 4, Redesdale. sheet 
13 S.E. 
Occurs in white and slate-colored 
seams, about 4 feet thick, under 5 feet 
of stiff clay, and rests on cellular basalt. 
From its great absorbent powers it 
might be used as fuller’s earth,. 
