224 NEW SOUTH WALES MINERALS. 
The following analysis was made for me by Dr. Helms :-— 
eile 
Loss ae ne heat . ‘ ee food 25 
cid See ee << See 
‘ : e 19°14 
Magnesia... s eae ee 07 
99°57 
The above results correspond to the formula CaWQ,. 
SIDERITE. 
Carbonate of iron. In this specimen the siderite is 
through a oo grey-coloured clay stone. From the cig 
hood of Jambero 
The following neta was made of the whole, as it was found 
impossible to separate the particles of siderite, so as to ascertain 
its value as an ore of iro 
Sp. gr. 2°79. 
Analysis. 
Water lost at 105°C. xi ons sie "932 
EB combi ned . ae one 1] 922 
write and insoluble matter ma eae 
tron protoxide oe uae ee eee 
anganese protoxide se . ae 
agnesia traces 
Potash soda ” 
Phosphoric acid ” 
Carbonic acid 7°816 
Titanic acid 716 
100°433 
TIN-STONE OR CASSITERITE. 
A specimen of dark-coloured, almost black stream tin-stoné, 
from the J mea Mine, Vegetable Creek, New England. 
Analysis. 
Stannic oxide (Sn0,) ... ss = 
Titanic acid (Ti0,)... sg 
Alumina ... Bi se see 80 
Iron sesquioxide ... so ne 
Sp. gr. 6-629. 
