PHYSIOGRAPHY. 



Anthracite. Antimonial Silver. 



smaller streams which descend from the mountains ; and the whole of 

 this extent is completely overlaid by coal beds of various thicknesses, re- 

 peated again and again with their attendant rocks. The neighboring 

 counties of Schuylkill and Lehigh abound in this species also, where it 

 occurs under similar circumstances. The Anthracite of Pennsylvania is 

 distinguished by its sub-slaty and conchoidal fracture. Very frequently 

 also, it is liable to the most splendid tarnishes which this species ever 

 presents. A second Anthracite region is Rhode Island, where a forma- 

 tion exists at Portsmouth ; and a third in Worcester, (Mass.) The An- 

 thracite of these last mentioned districts is remarkable for its irregular 

 columnar composition, dull grey color, and low degree of lustre. This 

 last variety is found on the Meissner in Hessia, forming the uppermost 

 division of a bed of bituminous wood, covered by basalt. It also occurs 

 in Scotland. The slaty Anthracite is found at Schonfield in Saxony, in 

 Savoy, at Kongsberg in Norway, at Staffordshire in England, in Ayr- 

 shire Scotland, and at Kilkenny in Ireland. 



5. On account of the difficult inflammability of this species of coal, and 

 its scarcity in Europe, it appears to have attracted little attention for eco- 

 nomical purposes. Its abundance in this country however, and the 

 cheapness with which it is raised, (it being worked in open quarries,) 

 have brought it into extensive use. At present, it forms the principal 

 fuel in the maritime cities of the northern states, and is applied to nearly 

 every purpose of raising temperature. 



ANTHRAKONITE. 



An impure Calcareous Spar, which owes its prismatic concretion- 

 ary form to some species of Favosites. 



ANTIMONIAL SILVER. Prismatic Antimony. 



MOHS. 

 Primary form. Right rhombic prism ? 



Secondary form. 



Fig. 31. 



M on M - 



- 120 0' 



3* 



