432 Transactions. —Geology. 
occurs in moderate sized dark-coloured crystals, having a pyramidal (tetra- 
hedral) form, and is associated with iron pyrites, acicular crystals of quartz, 
Galena, and traces of copper. Its matrix is a pure amorphous quartz. 
Specimens of blende were subsequently forwarded by the same contributor 
from Mine Bay, Great Barrier Island. 
In the same year Mr. Davis (Geol. Reports, 1870-71, p. 61), men- 
tions its occurrence at the Silver Crown Claim, Thames; at page 85, Mr. 
Skey mentions its occurrence at the Thames, and at page 149, Captain 
- Hutton also notes its presenee in the New Golden Crown Claim, in the same 
district. He also (at page 154) mentions the occurrence of this mineral in 
the Perseverance mine, Collingwood. 
Besides these localities Zine Blende has since been found in the reefs at 
Mount Arthur, whence the gold is extracted. 
All the specimens of Zinc Blende which have come under my notice are 
of a massive character but vary somewhat in appearance. The specimens 
from the Thames goldfield, which are well represented by those obtained 
from the Little Agnes mine, Tararu Creek, are black resinous samples of 
the mineral, known as ‘‘ Black Jack.” That from Collingwood varies from 
Black Jack to a yellow honey-coloured Blende, containing from 59°/, to 
65°/., zinc, and Captain Hutton thus describes its mode of occurrence At 
about five feet above the lode, in the felspathic slate, is a band some five or 
six feet thick, of Zine Blende and Galena. In the lower part of this band, 
the Blende is bluish-black, with a metallic lustre, while towards the upper 
part it is associated with Galena, which is sometimes crystallized, and here 
it is of a pale yellow colour, and a resinous lustre.” (Geol. Rep., 1870-71, 
p- 150.) : 
In examining this locality last year, I was led to the conclusion that at 
one part of the mine at least this Zine Blende and Galena formed a part of 
the lode since it occurred associated with quartz and Mispickel, had the rey 
felspathic slates for its hanging wall and black slates at the foot, which cor 
responds to the general position of the main Perseverance reef. Subse 
quently, however, I am informed a small shaft was sunk and the maim reef 
discovered 6 feet below this Zine Blende and Galena vein, as described by 
Captain Hutton, so that possibly these deposits are offshoots from the main 
reef. The other localities where Zine Blende has been found do not merit 
special description, as in no other case has it been discovered in sufficient 
quantities to prove of commercial value. Son 
Calamine, Zn G-—Mr. Skey (Geol. Rep. 1870-71, p. 85) deseribes this 
mineral from Tararu Creek, ‘Thames, as ‘‘Iustrous transparent erystels 
_ paratively small ; they are interspersed somewhat rarely with small ee 
