300 PROCEEDINGS OF SECTION C. 
Melilite basa’t is associated with the nephelinite. This 
is an olivine-augite-melilite rock, formimg certain little 
conical hills on the top of the Tier. A recent visit has 
shown the nephelinite and melilite basalt to be Tertiary. 
It is noteworthy that the discovery of the entire series of 
eleolite and nepheline rocks in Tasmania has been due to 
microscopical examination. 
A few weeks ago melilite was microscopically determined 
in the Tertiary fayalite basalt at the Alexandra Battery, 
Sandy Bay. This interesting occurrence is now under 
examination. 
A beautiful augite-biotitenepheline rock from Port 
Cygnet beach has just been determined by Professor Rosen- 
busch as nephelinite. 
Contact Rocks. 
Limurite. 
The augite-axinite rock at the Colebrook Mine, near Ring- 
ville, is the same as that which occurs in the Pyrenees, and 
to which Professor F. Zirkel has given the name Limurite. 
It consists of axinite, augite, actinolite, and calcite, with 
the other boric minerals, datholite and danburite. It car 
ries or is associated with large masses of pyrrhotite contain- 
ing from 1 per cent. to 3 per cent. of copper. Portions of 
the ore-body are somewhat richer in that metal. The mass 
as a whole appears to be divided into parallel bodies in meta- 
morphic slate. Serpentine and bronzitite form the country 
to the west. No tin ore has been found in the deposit, but 
stanniferous pyrrhotite lodes and tourmaline quartz-por- 
phyry courses traverse Silurian slate country further west. 
The Pyreneean rocks are described by M. A. Lacroix 
from the pic d’Arbizon and the neighbourhood of Baréges. 
In the latter district he refers to a series of banded lime- 
stones nearly 100 metres thick, which, at their immediate 
contact with granite, are wholly altered to a mixture of 
axinite and epidote. M. Lacroix describes some of the 
Pyreneean axinite' as almost in itself forming enormous 
masses of distinct rocks (limurites). Pyrrhotite is there also 
a constituent of the rock. 
In Cornwall, England, axinite has been produced by the 
action of granite upon basic rocks. |The question which re- 
quires to be answered in the Colebrook instance is, whether 
the pyroxene in che rock is original, and the rock basic; or 
whether the present rock is the product of the action of 
granite on limestone. My first impression was that the 
rock was genetically connected with the serpentines and 
Seen 
