MODE II. BASALT. 



With a mixture of amorphous black siderite, 

 and minute grains of white quartz, from the same. 



The same interspersed with transparent felspar, 

 which becomes greenish from the mixture, from 

 the same. 



Greyish black basalt, interspersed with black 

 siderite, partly amorphous partly crystallised, and 

 with greyish white felspar. 



The same, with black siderite, and small grains 

 of yellowish green olivine. 



The same, with black siderite, partly amorphous 

 partly crystallised, olive-green olivine, and scat- 

 tered particles of black mica. 



The same, superficially spotted with reddish 

 brown, probably from the decomposition of the 

 iron. 



Greyish black basalt, interspersed with crystal- 

 lised siderite, with small crystals of olivine in 

 square prisms, of which some being decomposed, 

 the surface becomes porous, while the interior is 

 completely dense *. 



Such is the catalogue of ancient basalts observed 

 by Wad in the Borgian museum, there not being 

 even one example of basaltin, though it certainly 

 occurs in small Egyptian monuments; and the 

 author saw at Paris the statues of a king and 



* Such basalts have deceived the volcanists. 



