906 Analysis of Native Copper found on Flat Island, 8$c. QNo. 142. 



Titanium again : 



The bright scales dissolved in slightly acidulated water : — 

 Caustic Potash — White, soluble in excess. 

 Ditto Ammonia — Ditto, permanent. 

 Carb. of Soda — ditto ditto, (dense white.) 

 Hyd. Sulp. of Ammonia — Black. 

 Ferro-chyaz. Potash — White. 

 Tincture of Galls — Pale brown. 

 Sulp. Acid — Dense white. 

 Nitrate of Silver — Ditto, ditto, nocculent. 

 they were therefore Muriate of Lead. 



In one experiment, another piece of the copper dissolved in Nitric 

 Acid, left a heavy white residuum, which, digested in concentrated 

 Sulp. Acid, left another residuum, which last digested in an excess of 

 Muriatic Acid, boiled and diluted with water, gave a solution which 

 shewed the presence of Cobalt ; as under : — 

 Caustic Potash — Brown. 

 Ditto Ammonia — Blue rose. 

 Carb. of Soda — Pale rose. 



Bi-carb. Ammonia — No re-action till the Acid was neutralized, 

 when pale rose. 



Hyd. Sulp. of Ammonia — Pale dirty yellow. 

 Ferro-chyaz. of Potast. Emerald green, (next day dark blue de- 

 posit.) 

 Tincture of Galls — Brown. 

 .'. Cobalt with a little Titanium. 



Summary. 

 This Mineral is an alloy of Copper, Titanium, Mercury, Lead, Co- 

 balt and Iron, in different proportions.* 



Remark. 

 The different pieces vary in their composition. 



S. MORNAY. 



No. 13, Chowringhee Road, 28th November, 1843. 



* There is, in the Philosophical Magazine for June 1843, an account of a Fahlerz 

 containing Mercury from Hungary, but we have as yet found no traces of Sulphur or 

 Antimony with our Mineral. The specimen which 1 examined, which was one of the 

 first sent up by Capt. Williams was nearly pure native copper, with a coating of red 

 oxide and the blue and green carbonates. — H. P. 



