1843.] Analysis of Native Copper found on Flat Island, tyc. 905 



The above-mentioned solution in Caustic Ammonia evaporated to 

 crystallization, gave beautiful blue crystals; those dissolved in water, 

 behaved as follows : — 



Caustic Potash — Pale blue, permanent. 



Ditto Ammonia — Pale blue, flocculent : in excess of Ammonia, 

 soluble with the beautiful blue color 

 characteristic of Copper 

 Carb. of Soda — Pale blue green, permanent. 

 Bi-carb. of Ammonia — Pale blue : in excess soluble with the same 



blue color, as above. 

 Hyd. Sulp. of Ammonia— Black. 

 Ferro-chyaz. of Potash — Brick red. 

 Tincture of Galls — No re-action. 

 Mur. of Barytes — Dense white, 

 they were therefore pure Sulphate of Copper. 



Residuum No. 1, melted by the blow-pipe, in the oxidizing flame 

 with Borax and Phosph. of Soda, gave a limpid gloss: but in the 

 reducing flame, at the moment of cooling it assumed a beautiful garnet 

 color, which was permanent, till the bead was fused again in the 

 oxidizing flame, when it became limpid. When much of the oxide 

 was used, the lead assumed a clear black instead of the garnet 

 color. 



In some experiments, the color was dirty brown, but a little tin 

 added, immediately purified the color. 



These two experiments prove the presence of Titanium and a little 

 Iron. 



Residuum No. 1, digested in Muriatic Acid, cold. (At the bottom 

 of the vessel, appeared small limpid crystalline scales, brilliant as the 

 diamond.) 



The solution behaved as follows : — 

 Caustic Potash — White, permanent. 

 Ditto Ammonia — Ditto ditto. 

 Carb. of Soda — Ditto ditto, (very voluminous.) 

 Hyd. Sulp. of Ammonia — Black. 



Ferro-chyaz. Potash — Emerald green. (In three days turned opa- 

 que dark blue and deposited.) 

 Tincture of Galls — Brown. 



6d 



