Cox.—On the Mineralogy of New Zealand. 401 
Halloysite, A, Si + 4 H.—The occurrence of this mineral in decom- 
posing basalts around Dunedin is mentioned by Dr. Hector (Jurors’ Rep. 
N.Z. Ex., 1865, p. 438), and a specimen from the Water of Leith is de- 
scribed by Professor Liversidge (Trans. N.Z. Inst., vol. x., p. 499) as 
follows :—* An opaque white earthy substance, soft and soapy; associated 
with it is a little black halloysite ; when immersed in water it gives off air- 
bubbles rapidly, accompanied by a singing sound; falls to pieces and 
becomes translucent on the thin edges; breaks with a eonchoidal fracture ; 
adheres strongly to the tongue; yields to the thumb-nail, and affords a 
shining streak; possesses an earthy smell." A sample of an impure form 
from Scinde Island, Napier, where it occurs in considerable quantities (Col. 
Mus. and Lab. Rep., vii., p. 18), was forwarded to the Museum in 1872, 
and had the following composition :— 
Silica .. ma v TA zc be ae 
Sesquioxide of iron .. 2. $5 5:82 
umina P ap: e. ss 0 E04 
Lime .. x Ys 74 ae 2:02 
Magnesia "pm ve s cig 2°53 
Water .. ii 23 P nr 4°81 
Alkalies and loss  .. as Fi 2-26 E 
100-00 
the high proportion of silica being due to the presence of grains of free 
quartz, which constitute the principal impurity. A specimen from the Bay 
of Islands was forwarded by Mr. J. Williamson in 1874, and is of a 
yellowish-brown colour, and very fine grain ; three specimens from the 
Drury and Hunua Ranges were forwarded by the Hon. H. Chamberlin in 
1875, and a specimen collected from Whangaroa Harboar, by Mr. A. 
McKay, during the same year. 
Fuller's Earth.—Specimens from Great Barrier Island and the Hot 
Springs, were exhibited at the Dunedin Exhibition of 1805, by the 
Auckland local committee, and are mentioned (Jurors' Rep. N.Z. Ex., 
1865, p. 253). 
Palagonite, (Al, Ee) Si? 4- 8 (Ca, Mg, Na) Si + 10 H.—The occurrence 
of this mineral as angular fragments in palagonite tufas is mentioned by Dr. 
v. Haast (Jurors' Rep. N.Z. Ex., 1865, p. 257), at Harper Hills, near the 
Belwyn, and at Two Brothers, Ashburton, as also another variety changing 
insensibly into a pitch opal, enclosing leaves and stalks silicified, in the same 
localities. A specimen from Taipo Hill, Otago, was forwarded in 1868 by 
Mr. C. Teschmaker, where it occurs as a large seam 60 feet thick, running 
in the direction of a limestone quarry. Its characters, as described by Mr. 
Skey, are—massive ; colour, black ; hardness, 4:5; somewhat friable E 
26 
