DOMAIN II. SILICEOUS. 



mica, which passes into siderite, from the cele- 

 brated quarry near Petersburg. Karsten Lesk. 

 Mus. 374. 



Granite, with milk-white felspar, spotted with 

 red, from the same place. Ib. 



Granite, with tombac brown mica, from Bo- 

 hemia. 



Granite, with Labrador felspar, from Norway. 



White granite, of w r hich the Escurial was built, 

 from Spain. 



Violet granite, containing large crystals of vio- 

 let-coloured felspar, from the Isle of Elba. 



Grey granite, from the Hartz. 



White granite, from the Cevennes mountains. 



Dark blue granite, from Brazil. 



Black granite, with black felspar, from the Alps. 



Grey granite, from Cornwall, the moorstone of 

 the country. It is white, with black and white 

 mica, large-grained, and takes a good polish. Da 

 Costa, whose book appeared 17,57, says, p. 273, 

 that it abounds with that kind of quartz which is 

 called felspar by the Germans. In the infancy of 

 the science the names of discrimination were very 

 few; and they will increase in proportion as it 

 advances*. 



* In his Observations Mineralogiques sur les Vosges, Nancy, 

 1782, 8vo. Sivry informs us, p. 93, that, on a mountain near Giro- 

 magny, there occur Varieties of beautiful granites in detached blocks; 



