MODE i. TALC. 307 



2157, appears to belong to this division. It is 

 mingled with grains of white felspar, and cal- 

 careous particles, which effervesce with acids* 

 It is so soft as to be almost friable, and splits 

 into level horizontal layers : this curious rock re- 

 poses on serpentine, and is surmounted by a mi- 

 caceous lime-slate, strongly impregnated with si- 

 derous earth. 



Dr. Babington has the following varieties*: 

 " Composed of broad, shining, flexible folia, 

 closely compacted, and of a greenish w r hite co- 

 lour (Venetian talc), from Zillerthal in the Tyrol. 

 " This, from being of a white colour when re- 



' O 



duced to powder, and leaving a beautiful polish 

 on the skin, has long been employed as a cos- 

 metic. Mr. Hepfner found it to contain mag- 

 nesia 44, silex 50, alumine 6. 



" The same, on the surface of semi-transparent 

 felspar, of a pale reddish white colour, and shining 

 fracture, from the same place. 



" A polished slab of the same, of a pale green 

 colour, and intermixed with shining silvery lami- 

 nae, from Scotland. 



" Of a slaty texture, and greenish white colour 

 (schistose talc), from Bareuth. 



* Cat. St. Aubyn, 38. 



