MINERALOGY. 25 



PORCELAIN CLAY. 



The clays have not been analyzed, but there are clays at 

 the bases of some of the granite mountains, where the 

 felspar has decomposed so much, that the paths ai'e thick 

 with a course quartzose sand, and a few grains of mica that 

 remain. As porcelain clay is produced by the decomposi- 

 tion of felspar, such is probably the clay in the localities 

 to which reference has been made. 



potter's clay. 



The clay in which the petrified trees are found has the 

 appearance of fine potter's clay ; and' clays from the banks 

 of the Ataran and Gyaing rivers were found, Mr. O'lliley 

 says, " after several trials at the Calcutta mint, to possess 

 every good property of the best English fire clays." 



LOAM, Or BRICK EARTH. 



The alluvial beds within the reach of tide waters, con- 

 tain numerous strata from which bricks are made. 



REDDLE. 



Reddle, or red chalk is seen in the bazar, bu.t it is im- 

 ported, though it probably exists in the provinces. 



AUGITE. 



On the banks of the rivers near Maul main and Tavoy, 

 masses of dolerite are found which contain augite. They 

 are not however found in situ in the Provinces, and have 

 probably been brought from the Isle of France. 



HORNBLENDE. 



I have met with hornblende as a constituent of green- 

 stone ; but never in the Provinces in any other connection, 



LABRADOR HORNBLENDE, Or HYPERSTHENE. 



Baron des Granges, to whom was sent specimens of the 

 greenstone east of Tavoy, said that the hornblende it con- 

 tained was Labrador hornblende. 



