MINERAL from GREENLAND. 389 
60° and 120 with the fides of the prifm. With this, neither 
our mineral nor the Swedifh can have any connection, farther 
than fome analogy which may exift in their compofition. 
ConcERNING the Swedifh mineral, I have not been able to 
obtain much {fatisfactory information. There is a fpecimen of 
mt in Mr Atian’s cabinet, which he received directly from 
Sweden, fent by a gentleman who had juft before been in Lon- 
don, and was well acquainted with the collections of that city, 
from which it is inferred, that the {pecimen in queftion is the 
fame as that examined by Count Bournon and Dr Wotta- 
STON. 
WERNER has lately admitted into his fyftem a new mineral 
{pecies, which he diftinguifhes by the name of Fettstein. Of 
this I have feen two defcriptions ; one by Haiiy, in his Tableau 
Comparatif, publifhed laft year ; and another by Count DuniNn 
Borxkowsk1, publifhed in the 69th volume of the Journal de 
Physique, and tranflated in Nicholson’s Journal, (vol. 26. p. 384). - 
The fpecimen, called Swedish Natrolite, in Mr ALLAN’s pot- . 
feffion, agrees with thefe defcriptions in every particular, ex- 
cepting that its fpecific gravity is a little higher. Bor- 
KowsKI ftates the fpecific gravity of fettsten at 2.563; Haiiy 
at 2.6138 ; while I found the fpecific gravity of Mr ALLAN’s 
fpecimen to be 2.779, and, when in fmall fragments, to be as 
high as 2.790. This very near agreement in the properties of 
the Swedifh natrolite, with the characters of the fettftein, leads 
me to fuppofe it the fubftance to which WERNER has given 
that name. This opinion is ftrengthened, by a fact mentioned 
by Haiiy, that fettftein had been at firft confidered as a varie- 
ty of Wernerite. For the fpecimen fent to Mr ALLan, under 
the name of Compact Wernerite, is obvioufly the very fame with 
the fuppofed natrolite of Sweden. Now, if this identity be ad- 
mitted, it will follow, that our mineral conftitutes a fpecies 
apart. It bears, indeed, a confiderable refemblance to it; but 
neither the cryftalline form, nor the conftituents of fettftein, 
as 
