ON THE RUBIES OF BURMA AND ASSOCIATED MINERALS. 
203 
Fig. 16. 
Pyroxene-scapolite-gneiss from Mogok. x 3 diameters. Very dark-green pleochroic crystals of 
augite, are seen scattered through a mass of felspar and scapolite crystals, the latter being so full 
of inclusions as to show an opalescence like that of moonstone.” In ordinary light the scapolite 
is distinguished from the felspar by its slightly darker tint. 
Fig. 17. 
Hornblende-biotite gneiss passing into a caciphyre, from the ridge near Letnytaung X 6 diameters. 
The dai’k crystals are deep brown hornblende, with intergrowths of biotite. On the left we have 
somewhat decomposed plagioclase felspar, while over the rest of the slide calcite pi evails. 
2 D 2 
