OBDEB II. NON- BITUMINOUS MINERAL- COAL. 65 



Stangenkohle. Glanzkohle. WERJT. Hoffm. H. B. III. 

 1. S. 295. 314. Anthrazit. HAUSM. I. S. 70. Koh- 

 lenblende. Glanzkohle. Stangenkohle. LEOXH. S. 667. 

 668. 672. Anthracite. HAUY. Traite*, T. III. p. 307. 

 TabL comp. p. 69. Traite', 2de Ed. T. IV. p. 440. 



No regular form or structure. Fracture conchoidal, 



often perfect. 

 Lustre imperfect metallic. Colour iron-black, 



sometimes inclining to greyish-black. Streak 



unchanged. Opake. 

 Not very brittle. Hardness = 2-0 ... 2-5. Sp. 



Gr. =r 1-400, columnar coal from Meissner ; 



= 1-482, glance coal from Schonfeld, in Saxony. 



Compound Varieties. Massive : composition la- 

 mellar, faces of composition either smooth and shin- 

 ing, or rough ; generally impalpable, fracture con- 

 choidal, more or less perfect. Some varieties are 

 vesicular, others divided into columnar masses, 

 meeting in rough faces. 



OBSERVATIONS. 



1. Besides Glance-Coal, the present species contains 

 also the Columnar Coal, which in the Wernerian system is 

 comprised in the species of Black Coal, to which, however, 

 it does not belong. The Columnar Coal in particular is re- 

 markable for its irregular columnar composition, which is 

 probably produced by fissures, and the low degree of lustre 

 in its fracture. Glance-coal has been divided into Con. 

 choidal and Slaty Glance-Coal, the latter of which in parti- 

 cular is designated by the name of Anthracite. The first 

 of them possesses a perfect conchoidal fracture, the second 

 is compound like Slate CoaL 



2. The varieties of the present species do not contain any 

 bitumen, but consist wholly of carbon, occasionally mixed 

 with variable proportions of oxide of iron, silica, and alu- 



VOL. HI. E 



