lis Boxi^en^s Analysis of Calcareous Tungsten^ <5r. 



grammes, A portion of the Coloplionite 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 0,75G 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 liquor (D) was boiled with caustic potash, and 

 w^as thus found to contain no Magnesia. 



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



A. Water, - - 00.333 containing oxygen, 



B. Silica, - - 38.000 - - - 19J1 



C. Protoxide of Iron, 25.200 - ^ - 05,73 



C. Alumina, - - 06.000 - - • 02.80 



D. Lime, - - 29.000 - * - 08.14 



98.533 

 100.000 



001,467 Loss. 



/ 



Therefore the mineralogical formula of this Garnet is 



A/S^+'2FeS + 3CaS. 



N. B. The results of ray 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. Bowen. 



This mineral was discovered a short time since amoi^ 

 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 



