892 Transactions.— Geology. 
wollastonite passing into scapolite by substitution of alumina for lime. It 
is a green-coloured mineral, quite amorphous, and occurs coating one side 
of a tough light green rock, probably jade. 
Chrysolite (Olivine), (Mg, Fe)? Si.—The first mention of the occurrence of 
this mineral in New Zealand is by Dr. Hector (Jurors’ Rep. N.Z. Ex., 1865, 
pp. 266, 418, and 487), who states that it is of frequent occurrence in the 
basaltic rocks of Saddle Hill and elsewhere, and also occurs in Milford 
Sound. It is again mentioned by Dr. v. Haast (Jurors’ Rep. N.Z. Ex., 
1865, p. 257) as grains in the basaltic rocks of Banks Peninsula, and 
(Trans. N.Z. Inst., vol. i., p. 180) as large concretions in basaltic rocks 
from the Chatham Islands, and (Geol. Rep., 1870-71, p. 29) in the basalts 
of the Hurunui and Mandamus districts. R. Daintree, Esq., F.G.S., refers 
to its occurrence in dolerites from the Selwyn River, Snowy Peak Range, 
Flagstaff Hill basin, and Hororata district, (Trans. N.Z. Inst., vol. vii., p. 
458); Professor Liversidge also describes a specimen from Dunedin as 
brown-coloured imbedded grains (Trans. N.Z. Inst., vol. x., p. 497), and I 
have noticed small grains of this mineral, green and brown in colour, in 
many microscopic sections of basaltic and doleritic rocks from various 
localities. : 
Dunite.—'This mineral is a massive variety of olivine through which 
grains of chromite are scattered. A specimen from the Dun Mountain, 
Nelson, was first described by Dr. v. Hochstetter (New Zealand, 1863, Eng. 
ed., p. 474) as follows :—* It consists of a very peculiar kind of rock, of a 
yellowish-green colour when recently broken, but turning a rusty brown on 
the surface when decomposing. The mass of the rock is olivine, containing 
fine black grains of chromate of iron interspersed ; it is distinguished from 
serpentine, for which it was formerly taken, especially by its greater hard- 
ness and its crystalline structure. I have called it Dunite.” Analysis of 
dunite by R. Reuter (Lab. of the Polyt. Inst. of Vienna) :— 
Silica .. 
Magnesia js =e PP 
Protoxide of iron  .. 9°40 
Water .. : "7 Sp.gr... 3°30 
100°15 
It is again mentioned by Dr. Hector (Jurors’ Rep. N.Z. Ex., 1865, p. 411), 
who adds to Dr. v. Hochstetter’s description, that it possesses a flaky 
structure, conchoidal fracture and hardness of 6; and he also mentions its 
occurrence at Milford Sound, where it passes into jade. He again alludes 
to it (Trans. N.Z. Inst., vol. ii., P. 977), stating that at the Dun Mountain 
it appears at the surface as a large mass several miles in extent. It has 
since been discovered at Jackson’s Bay, by Mr. D. Macfarlane, associated 
with serpentinous rocks (Geol. Rep., 1876-77, p. 27). 
