244 A S Y S T E M O F 



with in the other mineral mountains of 

 Sweden. In ibme 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 qiiartzofis mica con- 

 voluiis. 

 a. Whitifh grey, from Morthernberget 



in Norberke in Dalarne. 

 h. Greenifh, at Salberg in Weft man- 

 land. 

 c< Reddifb, from the parifti of Making 

 in Dalarne. 



Both thefe kinds of Stellften are for 

 their refiftance to the fire employed 

 in building furnaces : but the latter 



«z> * 



is the belt, becauie it feems at the 

 fame time to contain a little of a re- 

 fractory clayifh fubftance : It however 

 cracks very foon, if the fiat fide of 

 th^ ftraturn, inftead of the extremity, 

 is turned towards the fire. It is alio 

 of great ufe in mills, if the ether or 

 fellow- ftone is made of the mill-flone 

 from Arfunde, which is a Saxum of 

 the conglutinated kind, or a coarfe 

 iand-ftone. It is lucky for ceconomi- 

 cal purpofes, that the plates of thefe 

 Hones are fo thick, although thereby 

 they are not fo eafily fplit. 



SECT. CCLXIII. 



C. Norrka. Murkften of the Swedes. Saxum 

 compofitum micd^ qiiartxo et granato. 

 i. With diftinct garnets or fhirl, Granaiis 

 diftinfiis cryftaUifatis* a. Light 



