MISCELLANEOUS CLAYS. 195 



(No. 67 S.) 

 CLAY FROM W. D. BAGWELL'S, 



SEVEN MILES NORTH OF FAVETTE COURT HOUSE, FAYETTE CO. 



A gritty clay, that slakes slowly but completely to fine 

 grains. 



The clay required 28 per cent, of water to make a 

 washable mass, which was slightly plastic and gritty. 

 This paste shrunk 6 per cent, in drying and 3 per cent, in 

 burning, giving a total shrinkage of 9 per cent. 



The average tensile strength of the air dried briquettes 

 was 45 pounds per square inch, with a maximum of 53 

 pounds. 



Incipient fusion occurred at 2100 F., vitrification at 

 2250 F., and viscosity at 2409 F. 



The clay burns to a deep buff color. 



Its composition is as follows : 



Analysis of Clay from W. D. Bagwell, Fayette Co. (No. 67. S.) 



Silica (total) 75,70 



Alumina 14.36 



Water 4.45 



Ferric oxide 4.64 



Lime tr. 



Magnesia tr. 



Moisture 1.24 



100.39 



Free silica (sand) 58.60 



Total fluxes 4.64 



Specific gravity 2.26 



, (No. .40 S.) 

 CLAY FROM H PALMER, 



BEXAR, MARION CO. 



A gritty, fine grained clay, containing scales of mica, 

 which slakes easily and quickly to irregular grains. 

 It required 26 per cent of water to make a workable 



