eti 
F.R.S., in his peep Gold Fields. 
in association with intrusions of basalt, largely ari 
~ for road metal, which have forced their way through the W Ge 
matta shale. 
: It possesses a coarsely crystalline rere but so decomposed ee 
as to be some broken up, and is in parts more or less friable. Some 
be contain so much magnetite as to really deflect the needle, 
Specific gravity, 2-780 at 18° C. 
tS? “\ 2 ee 
: H copic moisture at 100° C,...... “991 4 ae 
ar, Cacheaed cate r, by airect weighing pi baie 
Silica mt HE, 
Alumina " 2 
s : Iron sesquioxide ..............5 Vaihasscakes 
" 3» proto ide 
Manganese protoxide traces “ 
n Lime 9° 
Potash 1°612 i 
Soda 3°476 
: babies 
Basalt, Pennant Hills, Parramatta.—Of a a specimen of this rock, 
eruptive through the Wianamatta — the late Prof. A. M. 
n made the following analysis : 
Siliea 60°42 
ADO 5 2 ub iiss Se icuee aceite Seva ste 10°29 
Tron oxides 14°10 
ime 
Magnesia -06 
] 181 
Soda hae ys 2°39 
Water, by difference ..............00000 : is Sas 
— 100-00 
__ From the large quantity of silica and the sana ps a 
‘Alumina, lim e; &e., } siping fbi it looks as if the basalt had 
pen sirialy haeane: into seen prior to analysis. 
ag Si, Pham i Queensland.—Of a green n colour, co mpact 
king witha RE conchoidal fracture. Fig. i, 
gravity, ite! 
