NEW SOUTH WALES MINERALS. 221 
MONITE CONCRETIONS. 
In the form of small peeps nodules, some of which are 
as spherical as marbles, in other cases they are more or less 
elongated ; or two or three of the globular forms may be joined 
together. Some possess a curiously wrinkled or corrugated sur- 
present indications of a radiate fibrous structure also. 
hydrated oxide of iron seems to have been originally ‘iffased 
through an impure carbonate of Eee and pol then to have 
segregated together into these co ae fom occasionally 
the nodules are met with pene sie? in such a mai 
Hardness, 3-4 ; Sp. gr., 3°52. The streak or ribet is yellow. 
Analysis. 
Water a = i ee os ceo eee 
Silica aGe = nice fe geo / BIS 
Alumina ai ee Be ae : 
Tron sesquioxi xide a perme |g: 
a ganese protoxide we So 561 
Magnesia ie er sy “ a traces 
2a eas UE ene OS 
100-000 
MAGNETITE. 
“aah a vein at Wallerawang, where the magnetite is associated 
with a vein stuff or matrix nay composed of a ferruginous 
gamet.? “The following analysis was made upon an intimate 
mixture of the two minerals as they occur in the vein. 
Analysis. 
Water be ee 100 Oe i oe 30 
A) mbined ... ae i i ee 
“eae BY Be as c30 2S 
+ soluble ap oe 
Alumina 1°35 
Tron protoxide 3°67 ‘im = 41°87 , 
» sesqui xide 55°74 tallic iro: 
= hn 
om ee te pe ke ae “62 
Sulph i dee i ... traces 
Phiephori ric acid ... ne a ... traces 
Scare wg oe a cn Ba *b4 
100°00 
<a iret Saal 
» See Jour. Roy. Soc. NSW. 1873, p. 96. 
® See also Tren and Coal praia Wallerawang. Jour. Roy. Soc., 
N.S.W., 1874. 
