216 NEW SOUTH WALES MINERALS. 
Analysis. 
Water lost at 120°C. ... re xii 11°92 
red heat ... act See 9 
Copper oxide — a a te 
Tron ie ai Sos trace 
sien a re 43°11 
29 
100-00 
Which does not answer to the usual formula. It is probable that 
some of the silica exists in the free state. 
GROSSULARITE. 
Lime alumina garnet. 
From near Mudgee ; of a rich dark brown colour ; translucent. 
Imperfectly crystallized i in groups of large rhombic dodekahedra. 
tenes | 
Silica ae are es 40°17 
Alumina ... a oi ... sae 
Tron sesquioxide . apuape Re 285 | 
Tron oh se 4G 3165 
een :protoxide ts a a 3°700 | 
ia (it | 
M Te ee dil cae 
C logue Re ee 254 | 
100°072 | 
HALLOYSITE. 
Black ; brittle ; conchoidal fracture ; black streak on zi 
Somewhat greasy feel; does not atten to the tongue. 
readily scratched by nail, leaving shiny ‘ 
Collected by Mr. ©. 8. Wilkinson, F.G.S., from near Berrima 
Analysis. 
Water lost at 105°C... ee ie 
», combined... ne es a 
Silica up sie oe ee 45°99 
oe gay se P ai ee . es 
ee Te 
100°000 
HaMatITE. Oty 
in irregalat 
common in the Hawkesbury sandstone, a noduless 
deposi, crevices, —_ as concretionary masses he sand and 
gives a red streak. Is often more or less mixed 
other impurities. 
