N. S. WALES COPPER ORES CONTAINING IODINE. 161 



No. 2. Earthy mixture of sulphide of copper, mala- 

 chite, kaolin and gangue, from Balaclava, p 2 d C ent. permit. 

 Broken Hill 0-01 0-005 



No. 3. Cuprite with little malachite, Cobar ... 0-017 0-002 



No. 6. Cuprite, mostly decomposed to malachite 



and azurite, Overflow Mine 0-01 0*006 



No. 8. Malachite with little sulphide of copper from 



Blayney 0*07 0-32 



No. 9. Malachite inside cuprite, and native copper, 



Wiseman's Creek 0015 0-032 



No. 10. Sulphide of copper with a little malachite 



and kaolinised felspar 032 0028 



The following six samples showed no iodine, and were not tested 

 for silver : — 



No. 4. From Young Australia Mine, Cobar. 



No. 5. From Nymagee. 



No. 7. From New Mount Hope. 



No. 1 1 . From Tuglow, Oberon. 



No. 12. From Bald Hill, Emmaville. 



No. 13. From Brunswick River. 



Samples of pure malachite from the Burra Burra Mine gave 

 also negative results. 



Iodine in such small quantities will not be payable, and there- 

 fore is not of commercial interest, but most decidedly will offer 

 room for further research by the geologist and mineralogist. 



Since Baumann (Professor of Chemistry, Freiberg) in 1886 

 found that the thyroid or scutiform gland (glandula thyrioidea) 

 of human beings and most mammals contain iodine, if in a healthy 

 and normal state, it is of physiological interest to find in nature 

 new sources of it. It being somewhat inexplicable where this 

 iodine comes from. As to the state in which the iodine exists 

 in the ore, the writer is inclined to believe it to be cuprous iodide. 

 The synthetic formula for silver iodide requires 46% of silver and 

 54% iodine, and will by comparison with above results not allow 



K— Dee. 6, 1899/ 



