Art. IX I Watson, Manganese Ore-Deposits of Georgia. 175 



which are the ore-bearing formations in the Cartersville district. 

 The ore-occurrence in the residual clays is identical for the two 

 districts. In the Cave Spring district the ore has been observed 

 penetrating and filling the cracks in the partially decayed rock 

 below in all directions with much the appearance of brecciated 

 -masses. 



Associated Ore-Deposits. — Beds of brown iron- ore are fre- 

 quently found in close relation with the manganese-ores. They 

 are much more extensive and more constant than those of man- 

 ganese, and the iron displays a greater tendency to a bedded 

 form and a less tendency to the nodular form. The region in 

 the vicinity of Cave Spring and Cedartown is probably the 

 largest brown iron-ore-producing area in the State. A few 

 scattered deposits of bauxite occur, but this mineral is less 

 closely associated with the manganese than are the beds of iron- 

 ore. 



Chemical Composition. — Only the oxides of the metal occur, 

 the principal ones of which are psilomelane and pyrolusite. 

 Admixed with these two oxides occur varying smaller percent- 

 ages of several of the other oxides, especially braunite. The 

 following chemical analysis of specimens of the purer ore col- 

 lected from the mine of Major Couper, south of Cave Spring, 

 and analyzed by Mr. Britton, will indicate the general character 

 of the ores. 



Analysis of Manganese- Ore, Cave Spring. 



Metallic manganese, ...... 53-44 



Ferric oxide, ....... 2.83 



Barium oxide, ....... 3 52 



Silica, ........ 7 yg 



Alumina, ........ i_52 



Lime, ........ 0.08 



Phosphoric acid, - - • - - - - 0.147 



Water, - - - - - - - . 1.56 



•Oxygen with manganese, undet., etc., .... 24.013 



Total, ........ 100.000 



Other Manganese-Deposits of the Paleozoic Group. 

 Under this heading are included certain centers about 

 which are grouped a few scattered deposits of manganese-ores. 



