VOLCANIC ROCKS,—CASE V, 23 
NEWER VOLCANIC. 
1. Dense, Brack BASALT. 
S.W. of Kyneton. 4 sheet 9 S.E. 
Compact, hard and brittle, with a flat 
conchoidal fracture; contains minute 
crystalline grains of olivine, and per- 
haps nepheline, disseminated through it. 
The rock is in appearance very much 
like Lydian stone. An analysis gave 
the following results, 5 per cent. only 
being soluble in hydrochloric acid :— 


Soluble Insoluble 
portion. portion. 
Silica +» 34°80 63°39 
Alumina .. 38°58 16°11 
Manganese . trace 1-01 
Iron .. >. .. 1807 10°03 
Lime oe T oy hy 526 
_ Magnesia .. trace 3'41 
Potash ee 7 
Soda .. Ea a eal 
Titanic acid .. si < 063 
Water so e 143 éx 
Oxide of coppe: oe trace 
100°00 102°05 


2. Dark, Compact BASALT. 
Map No. Ra 28a. 
Hill in section 28, north boundary 
of Woodend township. 4 sheet 
10 N.E. 
With cavities containing olivine: 
quarried for road metal. 
3. BASALT. List No. Rs, 1. 
Mount Shadwell. 
Fine-grained and dark colored, con- 
taining nests of olivine in green and 
amber-colored, crystalline masses. 
4. BASALT. 
Jim Crow Oreck. } sheet 15 S.E. 
Dark grey and compact, with fine- 
grained texture, and containing flattened 
vesicles. 
5, BASALT. Map No. Ra, 43. 
Quarry in reserve, section B2, 
Woodend. } sheet 9 S.E. 
Of a bluish-grey color, with felspar 
crystals (oligoclase) abundantly dis- 
seminated through it, and a few crystals 
of olivine. A good road metal, 
6. BASALT. Map No. Re 29. 
P.I. Claim, Durham Lead. 4 sheet 
63 S.E. 
Of a grey color and fine-grained, 
with small scattered crystals of olivine 
and a patch of quartz. (See Table of 
Analyses, page 94.) 5 
7. BASALT. Map No. R. 60. 
Section8, Newham. sheet S.W. 
Hard, dark and compact, close- 
grained and felspathic, containing a 
large amount of olivine. A good road 
metal. 
8. SLATY BASALT. 
Lot 8, section 5, Burke. 
9 S.W. 
It is slightly porphyritic, with small 
crystalline grains of olivine, triclinic 
felspar, a black mineral and a dark red 
transparent one, probably zircon or 
garnet. The base is very hard and 
dense. 
Map No. Ra 39. 
4 sheet 
8a. SLATY BASALT. 
S.W. of Kyneton 4 sheet 9 S.E. 
This resembles an altered slate, and 
in place has aregular dip and strike, but 
varying in all directions. The rock is 
dense and of a mottled grey color. 
9. BASALT. Map No. Re 28. 
Hardie’s Hill, near Crisis G. M. 
Co., Durham Lead, } sheet 63 
S.E. 
Dark-colored, fine-grained, minutely 
vesicular and obscurely laminated. 
10. BASALT. 
Degraves’ Mill, near Kyneton, 
F sheet 9 S.E. 
Of a dark grey color, containing cavi- 
ties coated with crystals of chabasite, 
also grains of olivine and kernels of 
a white magnesian clay. 
11. Basarr (Anamesite), 
Map No. Ra 66. 
Table Hill, near Guildford. 
4 sheet 15 N.E. 
Dark grey, with cavities containing 
carbonate of lime, spherosiderite and 
crystals of arragonite. 
lla. Basar (Anamesite). 
Map No. Ra 70. 
Little Red Hill, Churchs Flat, 
Fryer’s Creek, } sheet 15 N.E. 
Of a dark bluish-grey color, Occurs 
as a dyke, forming the eastern wall of a 
quartz reef. A compact, close-grained, 
porphyritic rock, containing embedded 
grains of triclinic felspar and olivine. 
