Muriatic Genus. 67 



According to the analyfis of Mr. Bayen, 100 

 parts of it contain about 41 of filex, (which 

 he takes rather to be mica) 33 of magnefia, 

 10 of argill, 12 of water, and about 3 of 

 iron. The ferpentine of Corfica contains a 

 larger proportion of argill and a fmaller of 

 filex. 



The greener forts of this ftone have been 

 called nephritic. 



SPECIES VI. 



Pure Magnejia intimately mixed 'with nearly 

 twice its 'weight of Si/ex, and lefs than its 

 own 'weight o 



Venetian Talc. 



Its colour is white, grey, yellowifh, or 

 greenifti : it is foft and foapy to the touch, 

 and in thin pieces femi-tranfparent : it is 

 compofed of very thin laminae difpofed in a 

 laminar or filamentous form, much tenderer 

 and more brittle than thofe of mica, but like 

 this it has a metallic luftre: its hardnefs is 

 fo inconfiderable that it may be fcratched with 

 the nail : its fpecific gravity is' 2,729. 



It does not effervefce with acids, and is fo- 

 luble therein very difficultly by particular ma- 

 nagement, and only in part. 



F 2 In 



