992 NEW SOUTH WALES MINERALS. 
The finely divided ore was then separated by means of a magnet, 
the gms and non-magnetic parts then examined separately. 
The portion removed by the magnet amounted to 56%, but as 
will be seen Wy the following analyses it was found impossible 
this means to obtain the magnetite quite free from the vein stuff. 
Analysis. 
Magnetic. Non-magnetic. 
Water lost at 100°C... 26 "21 
2 COMPING... i -.. 169 1:14 
Silica tt i eee 8°61 28°66 
Silica soluble fo 65 3°88 
mina ... Sesto POT 1°13 
Tron protoxide ... ... 6°91 “56 
», Sesquioxide ... ... 70°47 35°91 
Manganese protoxide ... 2°39 1°62 
Zinc-nickel, traces of ... of bs lea 
Lime ee ae 6S 24°44 
Magnesi. i ae 20 1:00 
Phosphoric acid. vs traces... ae 
Su noe red wi .. traces pine 
Carbonic acid... ... absent 1°66 
100°24 100°21 
The non-magnetic part thus answers to the general formula 
for the iron-lime- -garnet, 3 CaO,2 SiO, + Fe,0;, SiO, 
HAUSMANNITE. ? 
compact mineral, with a very mi 
ture ; strikes fire with steel ; fracture euclidean of a 
iron-grey colour. Found in the Wellington district. 
Sp. gr. 6-466 ; hardness, 6°5. 
Soluble in hot strong hydrochloric acid, with evolution of 
chlorine, a residue of white silica being left. 
talline struc- 
. at 
i 
_—- 
ps si a ea ee 
Trap sacantio ve Her ign 
Man rete oor : nee = a 
rand ‘ao 
10 
mineral is one of unusual hardness and specific specific gravity iy for 
one consisting essentially of the oxides of manganese, with 
is probably present merely as an impurity in combination 
the iron and alumina. 
