















Effect upon the stone of high temperatu 











Vitrified f 

 Color clia 

 Color cha 



Fully cal 

 Fully cal 

 Fully cal 

 Fully cal 



Much cal 

 Fully cal 



5omewhat, color destroyed, 

 Qged to a brownish red, str< 

 nged to dirty pale red, strei 



cined; crumbled to the tou( 

 cined; crumbled to the tout 

 cined; crumbled to the touc 

 cined; crumbled to the tou( 



cined; crumbled with a bio 

 oined: ornmbled to the i.nut 









ler. . . . . 























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