PLATE XVI. 



:i. Ama;:on-stoue, crystals. 2. LaJ^g^^pUfi J|^^f)lpA^.L*l>i'ftdoi'eBcent Felspar, poU^ed. 

 4. Moon-stone, .rough. 5. The Bame^ios^-) 6. pTeci/i{^iQpal, rough (Australia). 7. The same, 

 cut. 8. Precious Opal, rough (Hungary). 9. The same, out. 10. Fire Opal, rough. 11. The 



same, out. 



