Count de Bournon on Bardiglwne. 363 



ture of one of the varieties of this substance, of which I have never 

 seen but two specimens ; one in the collection of the late Mr. 

 Greville, the other in my own. The bardiglione of these two frag- 

 ments is of a light violet colour : it is intermixed with a great deal 

 ofactinote of a pale green colour, and of asbestos ; as well as with a 

 great number of small particles of yellow copper ore, of pyrites, and 

 of magnetic iron ore, (fer oxydide) which makes them act strongly 

 on the magnetic needle. I have said, in No. 77 of the Journal des 

 Mines, that I presumed, from the nature of the substances accompa- 

 nying it, that this bardiglione came from Sweden or Norway. The 

 specimen I have, was given to me about two years ago, with a posi- 

 tive assurance that it came from Sweden ; but I could not gain any 

 more particular information respecting the place. 



M. Mohs, in the same catalogue, mentions two specimens of bar- 

 diglione of a similar texture, and of a smalt blue colour, one from 

 Carinthia, the other from Swabia. This variety appears also in the 

 violet bardiglione from the lead-mine of Pesai near Mont Blanc. 



2. With large lamina, very thin, and placed one upon another, so 

 as to form separate and distinct aggregations. This variety, which is 

 of a very beautiful white slightly inclining to blue, comes from Vul- 

 pino, a few leagues from Bergamo in Italy. Its laminse are very 

 thin, and placed one upon another, so as to form little separate aggre- 

 gations, crossing each other in different directions, and giving the 

 whole mass sometimes a lamellar, sometimes a fibrous appearance, 

 according as the eye is directed toward the flat sides of the laminse, 

 or their edges. This variety, which belongs to one of those of the 

 stone known by the name of Marmo Bardiglio di Bergamo, takes 

 a very fine polish, and has often a little admixture of quartz. 



3. With small lamina, in an uniform direction. This variety differs 

 from that with large laminse, only in regard to their size* I have a 



2 z 2 



