244 
A SYSTEM OF 
with in the other mineral mountains of 
Sweden. In fome of thefe the quartzofe 
particles predominate, and in others, the 
micaceous : In the laft cafe it is com- 
monly flaty, and eafy to fplit. 
2. Of particles which are wrapt up in one 
another, Particulis quartzofis mica con- 
voliitis. 
a. Whitilh grey, from Morthernberget 
in Norberke in Dalarne. 
h. Greenifh, at Salberg in Wcilman- 
land. 
Reddifh, from the parifh of Maiung 
in Dalarne. 
Both thefe kinds of Stellfcen are for 
their refiftance to the fire employed 
in building furnaces ; but the latter 
is the betf, becaufe it feems at the 
fame time to contain a little of a re- 
fradory clayifli fubftance : It however 
cracks very foon, if the fiat fide of 
the ftratum, inftead of the extremity, 
is turned towards the fire. It is alfo 
of great ufe in mills, if the other or 
feilow-ftone is made of the miil-ftone 
from Arfunde, which is a Saxum of 
the conglutinated kind, dir a coarfe 
fand-flone. It is lucky for ceconomi- 
cal purpofes, that the plates of thefe 
ftones are fo thick, although thereby 
they are not fo eafily fplit. 
■ SECT. CCLXIII. 
C. Norrka. Murkfien of the Swedes. Sa>:um 
CGmpofUur/i micdj quartzo et gravato, 
j . With diftind garnets or Ibirl, Granatis 
diJlinPiis cryfiailifatis. a. Light 
