OF THE ASBESTINE EARTH. 191 



the proper cxccfs of which being rcftored, a ge- 

 nuine alum was produced. 



It appears, therefore, that a centenary of 

 fteatites contains, of terra pondcrofa, o; of cal- 

 careous earth, 6; aerated magncfia, 17.1; ar- 

 gilaceous earth, 2 ; iiliceous, 80 ; and calx of 

 iron, 0.9. 



vi. Of tbc Aftcjlos of Bajlnccs. 



IN the mine called Baftnrcs, at Riddarhyttan, 

 js Ibund an ulbcllos of agrccnilh grey, with ve- 

 ry fine, foft threads, caiily broken ; mentioned 

 by Cronftcdt in his Mineralogy, 105, A. 2. and 

 *vhich often fcrves as a matrix of copper pyrites. 



EXP. 17. Roafted in a crucible, in a fire it 

 exhibits the fame character as the afbcftos in 

 general. 



EXP. 1 8. Nor does the blow-pipe occafion a- 

 ny extraordinary phenomena. 



EXP. io. By the ufual analyfis, from the cen- 

 tenary was obtained, of terra ponderofa, c; 

 chalk, 6; aerated magnefia, 16.8; argillaceous 

 arth, 6 j filiceous, 67 ; and calcined iron, 4.2. 



$ vii. 



