118 Bo'inen's Analysis of Calcareous Tungsten, fyc. 



grammes. A portion of the Colophonite in the state of a fine 

 powder was treated with nitric acid and calcined, and be- 

 came of a dark red colour, this shewed that the Iron exists 

 in the state of a protoxide and the 0.82 grammes of peroxide 

 are equivalent to 0.756 grammes of Protoxide on 3 gram- 

 mes or 25.20 per 100. 



On estimating the Alumina contained in the Saline liquor 

 by difference we have 0.18 grammes on 3 grammes or 6.0 

 per 100. 



D. When oxalate of potash was added to the preceding 

 liquor (C) a precipitate was formed, which after being wash- 

 ed and strongly calcined gave 0.87 grammes of Lime on 3 

 grs. or 29.0 per 100. 



E. The hquor (D) was boiled with caustic potash, and 

 was thus found to contain no Magnesia. 



The result of this analysis is thus, per 100 parts. 



98.533 

 100.000 



001.467 Loss, 



Therefore the mineralogical formula of this Garnet is 

 A/S2+2FeS + 3CaS. 



N. B. The results of my analysis of the Tabular spar, 

 were communicated to the Academy of Natural Sciences 

 the 5th of March, 1822. 



Art. XIV. — Analysis of the calcareous oxide of Tungsten, 

 from Huntington. Con. By George T. Bo wen. 



This mineral was discovered a short time since among 

 some ores brought for examination by Mr. E. Lane. The 

 specimen submitted to analysis was massive. Its colour 

 was yellowish gray — fracture small foliated — lustre resinous 



