1847.] The new Mineral Newboldite. 1133 



of Barium, and add the equivalent weight of sulphur to that obtained 

 in the solid state. 



5. Precipitate by carbonate of potass in excess. 



6. Digest again in nitric acid and precepitate the iron from the 

 solution by Ferro-Prussiate of Potass, allowance being made for the 

 Iron it contains. The solution evaporated is gelatinous, and this when 

 calcined is the earth. 



The results of the best of three analysis in which the assay was obtain- 

 ed by picking minute fragments with the forceps and examining them 

 by the magnifier, but of which I could only collect 7.33 grains, gave — 



Per Cent. 



Sulphur, 3.77 51.43 



Silex, 0.25 3.40 



Perox, Iron, 2.41. Iron, 1.68 22.92 



Earth (perhaps new,) 1 .31 1 7.86 



7.01 95.61- 



Water by an independent experiment, 0.08 



Loss, 0.24 3.39 



7.33 100.00 



As the proportion of sulphur is so large, we may at once assume that 

 the iron is a bi-sulphuret, in which case the 22.92 per cent, of iron 

 would require 28.84 of sulphur ; leaving thus 22.59 per cent, of sulphur 

 to combine with the 17.86 per cent, of the earth. 



The earth is obtained in so very small a quantity that it is impossi- 

 ble to do more than describe it and its peculiar properties, so far as 

 they can be ascertained with any degree of certainty, and wait till a 

 better supply* of the mineral enables us to determine it. 



This earth is of a pure white ; of a granular appearance under the 

 magnifier, light and powdery in the crucible, and not lumpy like 

 Alumina. 



Blowpipe. — When heated to a white heat on Platina, no change : 

 moistened and placed on Turmeric and litmus papers no effect, nor 

 does it give any remarkable light. 



* I have received an additional supply of the mineral, but unfortunately it is only very 

 minute veins or nests, and this time in the red carbonate of Cerium, described in the 

 Journal, Proceedings, July, 1846. 



