64 Elements of Mineralogy. 



of martial afbeftos differ in external appear- 

 ance from fome forts of flioerl. 



According to Mr. Bergman, this variety 

 contains from 53 to 74 parts of filex, from 

 12 to 28 of mild magnefia, from 7 to 14 of 

 mild calcareous Earth, from 2 to 6 of argill, 

 and from I to roof iron per cent, ico parts 

 martial afbeftos contain 62 of filex, 13,7 of 

 magnefia, 12 of calcareous Earth, 1,7 of 

 argill, and 1 0,6 of iron ; yet it gives in fufion 

 a white flagg. 



- II. VARIETY, 



Coriaceous Ajbeftos, Suber Montanum, Aluta 

 Montana^ Mountain Cork, Leather, <&c. 



This fort of albeftos refembles in texture 

 thofe fubftances from which it borrows thefe 

 fanciful appellations. It is eaiily diftinguifhed 

 by its elafticity and lightnefs, for it floats a 

 long time on water. In other refpe&s it re- 

 lembles the former fpecies, except that its 

 colour is either white, yellow, brown, green, 

 or black. 



loo parts of it contain from 56 to 62 of 

 filex, from 22 to 26 of mild magnefia, from 

 10 to 12 of mild calcareous Earth, from 2 

 Jto 2,3 of argill, and about 3 of iron. 



SPECIES IV. 



