76 KICKEL MUTEEALS FEOM KEW CALEDONIA. 



On immersion in water, tlie mineral falls to pieces with a sharp 

 crackling sound, splitting up into fragments with conchoidal 

 fracture-surfaces. At the same time it becomes translucent, and 

 acquires a much more vivid tint of green, and for some minutes 

 continues to give off a copious evolution of small air bubbles. 

 It adheres strongly to the tongue, and if allowed to remain 

 attached for a minute or two, it splits up just as when placed in 

 water. 



It is not greasy to the touch. Hardness, 2" to 2 5. Sp. gr., 

 2 '2 7. Streak, pale green. Heated in a closed tube it gives off 

 water and becomes grey. On platinum wire, with borax, it yields 

 the ordinary nickel bead. 



QUAKTITATIYE ANALYSIS. 



Determination of the TVater. 



The finely-powdered mineral was first dried at 100°, and then 

 a weighed quantity of it was heated to redness in a platinum 

 crucible, until it ceased to diminish in weight. 



I. -2302 gram lost -0120 gram = 5-212 per cent, of H.,0. 



II. -3684 „ „ -0196 „ r= 5-320 



Determination of the Silica. 



I. •5250 gram gave "2502 of silica = 47'276 per cent, of silica. 

 II. -967 „ „ -4564. „ zn 47197 



Determination of the Iron and Alumina. 



I. -5 gram yielded -0780 of Fe^Os and Al.Oa = 1-560 per cent. 

 II. -5 „ ' „ -0888 „ „ = 1-776 „ 



Determination of the Nickel. 



By precipitating with freshly prepared ammonium sulphide, 

 igniting, and then again igniting with ammonium carbonate, as 

 recommended by Forbes, — 



I. -5 gram yielded '1203 = 24-060 per cent, of NiO. 



II. -5 „ „ -1198 = 23-960 



Determination of Magnesia. 



Made in the usual way as pyrophosphate. 

 I. -5 gram gave -2396 pyrophosphate == 21-583 per cent. MgO. 



II. -5 „ „ -: 



2413 



= 21-738 



j> 



Traces of lime are present. 









I. 



II. 



Mean. 



Water 



... 5-212 



5-320 



5-266 



Silica 



... 47-276 



47-197 



47-236 



^^iO 



... 23-960 



24-060 



24-010 



Al,03 + Fe,03 



... 1-560 



1-776 



1-668 



CaO 



. . . traces 



traces 



— 



MgO 



... 21-583 



21-738 



21-660 



99-591 100091 99-840 



