BY EDWD. B. LINDON, A.R.S.M. 61 
The most noted locality, however, for the occurrence of this 
ore of manganese is at Gladstone, where there is a considerable 
amount of it; two analyses of the ore, made for the proprietor of 
the lode by Messrs. Johnson, Matthey & Co., are as follows :—- 
Per cent. Per cent. 
Available peroxide of manganese . 74.84 57-0G 
Protoxide of manganese 5 ; 8.20 9.30 
Oxides of iron : : . : 8.60 3.80 
Alumina : ; : é 3 2.80 2.00 
Carbolic acid . : - : - traces traces 
Sulphur .- : ; c j : 0.22 0.13 
Water. 5 : ; ; ‘ 3.80 2.70 
Siliceous insoluble matter : 1.10 25.00 
Loss ; : ‘ . : é 0.44 0.07 
100.00 100.00 
No gold or silver. 
At Leyburn, near Warwick, a very pure pyrolusite occurs, both 
massive, stalactitic, and in crystals of orthorhornbic form. ‘The 
casing of the vein is a ferruginous clay which is said to be 
slightly auriferous. 
VII.—HYDROUS OXIDES. 
TuRGITE—Comp. 2 Fe, O, + H, O. 
In some of the mines of the ‘Tinaroo district, turgite is said to 
be the matrix of the cassiterite, being probably derived from the 
decomposition of a chlorite very rich in iron, as the reddish-brown 
chloritic mineral occurs in the same lode. 
GOTHITE—BROWN HEMATITE—Comp. Fe, O, + H, O. 
This occurs widely with hematite and limonite ; it forms part of 
the auriferous ore of Mount Morgan, and is found in some 
quantities on Stradbroke Island in stalactitic form, and on the 
Pine Mountains. 
LIMONITE—Comp. 2 Fe, O, + H, O. 
Limonite is of a very general occurrence, since it is derived 
from the decomposition of pyrites and magnetite, and of other 
minerals, such as hornblende and augite, which contain iron in 
the form of the protoxide. It is found at Ravenswood, Charters 
Towers, Ipswich, and Warwick ; interlined with calcite on the 
Main Range in the Maranoa district ; as a pseudomorph after 
pyrites at Kilkivan ; and in botryoidal and stalagmitic masses of a 
