546 DOMAIN VI. CARBONACEOUS. 



are the most ample and satisfactory which have 

 yet appeared. 

 Brongniart's " Graphite is of a grey almost black, with a 



account. . . ' 



metallic lustre; it is sort, smooth, and even unc- 

 tuous to the feel ; its fracture granular ; it leaves 

 distinct marks on paper, clear, and of a bluish 

 black ; it even leaves marks on vitreous surfaces, 

 such as earthen-ware : its marks are grey, while 

 those of sulphuretic molybdena, which much re- 

 sembles it, are greenish. 



" Its specific gravity is from 2,08 to 2,26. It 

 consumes and volatilises under the blow-pipe, 

 by a continued heat. Nitre renders its combus- 

 tion quicker and more sensible. 



" Slightly rubbed on resin, it does not com- 

 municate any electricity to it, while it leaves a 

 kind of metallic coat. 



" This substance, according to the experi- 

 ments of Mess. Berthollet and Monge, is com- 

 posed of iron and carbon, in the proportion of 

 0,90 of carbon and 0,09 of iron. The iron is in 

 too small a quantity to rank graphite among the 

 iron ores. 



" 1. Laminar Graphite. It is found in la- 

 mellae, or rhomboidal, or hexagonal spangles ; it 

 is of a tin- white. 



" %. Granular Graphite. It is in mishaped 



