a Mineral from Faroe. 53 
On receiving this letter, I examined the specimens with 
greater care, to endeavour to discover crystals, and I could ob- 
serve with a lens, in several places, in one of them faces appa- 
rently belonging to minute crystals, and reflecting a fine lustre ; 
but still the portions so observed were too small, and the con- 
nection of the faces with one another not sufficiently apparent 
to enable me to draw any conclusion as to the crystalline form. 
As I have every reason, however, to hope that larger quantities 
of the mineral are in the possession of Count Breprmar, more 
light may possibly still be thrown on that matter. 
Its other external characters will, I trust, be held as suffi- 
ciently distinctive, especially when supported by the chemical 
analysis ; and in case mineralogists shall be willing to receive it 
as a new species, I should propose to distinguish it by the name 
of Dysclasite *, as expressive of the peculiarity in its external 
characters formerly mentioned, its remarkable tenacity and. diffi- 
cult frangibility. It will of course be arranged with the Zeo- 
lites. 
Since this paper was read, I have had a thin slice of the mi- 
neral cut and polished by a lapidary ; and Sir Davin Brewster, 
who was so obliging as to examine it, observed the same appear- 
ances as before, and found that it polarised light in all directions, 
shewing that the mineral consists of a congeries of crystals, ad- 
hering together in all positions. This structure may serve to 
explain its great tenacity. 
eee ee i 
* From Bus and «Awe. 
