MINERAL from GREENLAND. 389 



6o B 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 

 k in Mr Allan'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 fpecimen in queftion is the 

 fame as that examined by Count Bourn on and Dr Wolla- 

 ston. 



Werner has lately admitted into his fyftem a new mineral 

 fpecies, which he diftinguifhes by the name of Fettstein. Of 

 this I have feen two defcriptions ; one by Hauy, in his Tableau 

 Comparatif, publifhed lafl year ; and another by Count Dun in 

 Borkowski, publifhed in the 69th volume of the Journal de 

 Physique, and translated in Nicholson's Journal, (vol. 26. p. 384). - 

 The fpecimen., called Swedish Natrolite, in Mr Allan's pof- 

 feflion, agrees with thefe defcriptions in every particular, ex- 

 cepting that its fpecific gravity is a little higher. Bor- 

 kowski ftates the fpecific gravity of fettstein at 2.563 ; Hauy 

 at 2.6138 j while I found the fpecific gravity of Mr Allan's 

 fpecimen to be 2.779, an( ^? 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 Strengthened, by a fact mentioned 

 by Hauy, that fettftein had been at fir ft 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 considerable refemblance to it j but 

 neither the cryftalline form, nor the conflituents of fettftein, 



as 



