Muriatic Genus. 65 



SPECIES IV. 



. 



Mild Magnefia combined 'with Sikx, mild Cal* 

 car eons Earth, Barytes, Argill and Iron. 



Amianthus. 



In ftrufture this fpecies refembles the firft 

 variety of the foregoing ; confifting of long 

 parallel fibres, in fome degree flexible, and 

 foft to the touch. The furface of its frac- 

 ture is alfo uneven. Its colour, white, grey, 

 greeniih or reddifh : its fpeciric gravity 2,913. 



It does not effervefce with acids, and is 

 difficultly, and but partially foluble therein, 



It is fufible per fe in a ftrong heat, and alfo 

 with borax, microcofmic fait, and mineral 

 alkali, with effervefcence. In fufion it again 

 chryftalizes in filaments, but in a ftill ftronger 

 heat it forms a green glafs, which corrodes 

 the crucibles, as Mr. SauJJure has obferved. 



100 parts of the Amianthus of Tarentaife 

 examined by Mr. Bergman , afforded him 64 

 of filex, 1 8, 6 of magnefia, 6,9 of calcareous 

 Earth, 6 of barytes, 3,3 of argill, and i,a 

 of iron. 



F SHCIIS V. 



