MODE XII. MAGNESIAN GLUTENITE. 375 



telgsten of Cronstedt, consisting of indurated 

 steatite, mixed with micarel, or felspar, or schorl, 

 or tourmaline ; but this is rather a mingled mag- 

 nesian rock, as is the serpentine, interspersed with 

 quartz, mica, limestone, or garnets. 



Some authors, as already stated, regard the 



verde-antico as a bricia. 



a: jpppp 



STRUCTURE II. SMALL-GRAINED. 



These have scarcely been observed *. 



* Perhaps the rag-stone of Da Costa, p. 173, is of this kind, 

 being of a greenish grey, and of a talcous appearance. It is used as 

 a hone to give a fine edge. 



