OF AH KANSAS. 



175 



Carbonate of lime 50.075 



Carbonate of magnesia 32.487 



Potassa 0.130 



Organic matter, and loss 4.985 



100.000 

 The air-dried rock lost 0.10 per cent of moisture at 250 deg. F. 



No. 34. Dolomite, in which occur the zinc and lead ores at Wood's 

 mine, Marion county. 



A grayish-white, fine-grained dolomite; lustre sub-resinous from minute 

 crystalline, shining particles dispersed through the rock; easily reduced to 

 powder; powder grayish-white. 



Composition, dried at 230 deg. F: 



Silicia, with a trace of clay 3.191 



Alumina, with trace of iron 3.023 



Carbonate of lime 50.041 



Carbonate of magnesia 42.317 



Carbonate of zinc 1.950 



Potassa, with trace of soda 0.435 



100.957 

 The air-dried rock lost 0.23 per cent, of moisture at 230 de°- F 



No. 35. Red clay, occurring in veins and pockets in dolomite and 

 imbedding the zinc ore at the Bath mine, Lawrence county. 



A ferruginous clay of dirty yellowish-red color; soft; easily crumbling 

 to powder between the fingers; when burnt, assumes a bright orange-red 

 color. 



Composition, dried at 250 deg. F: 



Silicates, insoluble in hydrochloric acid« • 84.616 



Sesquioxide of iron 4.303 



Sesquioxide of manganese 0.236 



Alumina 3 . 515 



Carbonate of zinc 0.380 



Carbonate of lime 0.275 



Organic matter, and water 6.447 



99.772 

 The air-dried clay lost 4.32 per cent of moisture at 250 deg. F. 

 On account of the bright color which the clay assumes on burning, it 



