78 VICTORIAN MINERALS.—CASE XIV. 
8. OrtHOCLASE (Potash-Felspar). 
Hells Corner, Back Creek, Bayn- 
ton. 4 sheet 51 S.W. 
Occurs in combination with quartz, 
tourmaline and mica, along the bound- 
ary between the granite and Lower 
Silurian rocks. 
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8a. OrTHOCLASE CRYSTALS 
(“ Baveno” Twins). 
Three miles east of township of 
Bradford, near Maldon. 
Occur in a patch of quartz in the 
granite. 
Note.—Orthoclase forms one of the principal constituents of granite. 
It also occurs in veins, either solid, or massively associated with quartz. 
9. ALBITE (Soda-Felspar). 
Map No. Ra 58. 
Blacksmith’s Gully Reef, Fryers- 
town. + sheet 15 N.E. 
In narrow veins and druses, associated 
with quartz. Several parts of the 
reef assume a porphyritic appearance 
from embedded crystals of albite. An 
analysis, by the late Mr. C. 5. Wood, 
gave the following results :— 

Silica ... fen) +. 68°73 
Alumina ox soe) 20:55 
Sesqui-oxide of iron ... 0°20 
Wit. = erb Bae ... trace 
Potassa ... ap ... trace 
Soda ry: xn) ... 10°43 
99°91 

10. OLIGOCLASE (Soda-Spodumen). 
Map No. Md 31, 
Anakie Range. 4 sheet 19 N.E. 
Occurs in the newer basalt, associated 
with olivine and hornblende. 
‘An analysis, by the late Mr. C. S. 
Wood, gave :— 
Silica... eee eee 64°22 

Alumina ote e.. 23°87 
Sesqui-oxide ofiron ... 1°53 
Lime ... 6 ... trace 
Magnesia Fes ee 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. FIRE-CLAY 
Lal-Lal, near Ballarat. bi 
Occurs as a bed, 3 feet thick, covering 
a lignite deposit. It forms an excellent 
fire-clay. The following is an analysis 
by the late Mr. ©. S. Wood:— 
Insoluble silicate of alumina 92°60 
Soluble silicate of alumina 1°33 
Oxide of iron t ... trace 
Soluble silica Zt <.. 0:53 
Water of constitution, driven 
off at red heat ... +. 5°80 

100°26 

13. PHOLERITE. 
Blacksmiths 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 folldws :— 

Silica... Bee woe 44:92 
Alumina tooo m ta 
Water ... ae eee 12°79 
100°40 

14. Cray. 
Blacksmith’s Gully Reef, Fryers- 
town. 3} sheet 15 N.E. 
The clay in which pholerite occurs. 
144. SILICATE or ALUMINA and 
MAGNESIA. < 
Lot 4, section 4, Redesdale: 3 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. 
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