556 DOMAIN VI. CARBONACEOUS. 



cific gravity, which is 1,8, is inferior to that of 

 graphite, in the proportion of 9 to 14 ; and ex- 

 ceeds that of coal, as 9 to 7. 



" This mineral is decidedly opake, it easily 

 allows the electric spark to pass, is hard to bum, 

 and in its combustion never produces but one 

 substance, which is carbonic acid. 



" The matter essential to its composition, is 

 mixed carbon ; or perhaps combined sometimes 

 with silex and iron, sometimes with argil and 

 silex in very different proportions, according to 

 analysed specimens. 



" 1 . Friable Anthracite. It is in mass, gra- 

 nular, not schistose, greatly soiling the fingers, 

 and easily crumbles. 



" 2. Scaly Anthracite. It divides into large 

 solid scales, the surface of which is unequal, un- 

 dulated, and shining ; it soils the fingers less 

 than the preceding. 



" These two varieties are found at the villages 

 of Arrache and Macot, in the neighbourhood of 

 Pesey, department of Mont Blanc. 



" 3. Schistose Anthracite. (Haiiy.) It di- 

 vides into laminae, with an uneven and undulat^ 

 ing surface. 



" 4. Globular Anthracite. (Haiiy.) It is 

 found in small globular masses, in crystallised 

 carbonate of lime, at Kongsberg in Norway, 



