of an Orchid Hunter 



153 



of black shale veined with pyrites of iron. Very Few 

 emeralds are found in die black stone, but by cutting 



WATER-WASHING PROCESS IN THE EMERALD MINE. 



down the face of the immense precipice veins of white 

 stone, calcitc, a crystallised form of carbonate of lime, 

 are uncovered in these veins. The emeralds are 

 sometimes embedded and sometimes found in hollow 



