Cox.—On the Mineralogy of New Zealand. 385 
Dolomite, Ca È + Mg G.— Dr. v. Haast mentions the occurrence of this 
mineral at the Malvern Hills (Jurors’ Rep. N.Z. Ex., 1865, p. 256) inter- 
stratified with augitic greenstone, and it was collected by Dr. Hector in 
1872 from Collingwood. 
Pearlspar.—A specimen of this mineral was collected by Dr. Hector in 
1878, from the Big Pump Shaft at the Thames. 
Epsom-salt, Mg S + 7 H.—Dr. Hector mentions the occurrence of this | 
mineral on Murison's station in Otago (Jurors’ Rep. N.Z. Ex., 1865, p. 438). 
SALTS or ALUMINA. 
Taranakite.—This mineral, which is a double hydrous phosphate of 
alumina and potash, part of the alumina being replaced by ferric oxide, was 
first discovered by H. Richmond, Esq., at the Sugar Loaves, Taranaki, 
where it occurs as thin seams which occupy fissures in the trachytic rocks. 
It is described by Dr. Hector (Jurors Rep. N.Z. Ex., 1865, p. 428) as of 
a yellowish-white colour; amorphous and soft; readily fusible before the 
blowpipe, and in other respects resembling wavellite. It has the following 
composition :— 
— acid is i «» 35°06 
Alum a 21:43 
s pt vH Y s v 4°45 
ime .. D5 
Potash 4:20 
Soda .. iraces 
Chlorine Ds s s% 
Sulphuric acid ‘ a .. . traces 
Insoluble in acid (silini) ; 1 “80 
Water driven off at 212? .. mei 33-06 
red heat 17:60 
” ” ” 
100-00 
and has a slight acid reaction. 
Wavellite, AJ P: + 19 H.— Occurs as thin seams of a dark, yellowish- 
brown colour, hard, translucent, and infusible, traversing the taranakite in 
various directions, and is mentioned by Dr. Hector (Jurors' Rep. N.Z. Ex 
1865, p. 494) 
Alunogene, Al 8* + 18 H, is mentioned by Dr. Hector (Jurors’ Rep. 
N.Z. Ex., 1865, p. 488) as occurring in some of the brown coals, In 1867 
a specimen was forwarded from Tuapeka by Dr. Halley, which proved to be 
nearly pure sulphate of alumina. It was colourless and well crystallized 
and completely soluble in water. The following analysis shows that its 
composition is— 
Sulphate of alumina, with traces of — oflime.. 55:60 
Sulphate of vt ee 5 1:01 
esià  .. we s> x 2:99 
Asi Sika. i ws vx 2x s vs 3:00 
Water v V. v s vv is i 37:40 
100-00 
25 
