

Mineralogy and Geology. 43 5 



Isle Royal. SteHite of Bergen JlilJ. 



I. II. III. IV. 



Silica, 53-45 5566 5400 5500 



Lime, 31-21 32*86 3210 3253 



Soda, 7-37 7-31 8-89 9-72 



Potash, trace. • • trace. 



Alumina, 4*94 1-45 190 110 



Water, 2-72 2-72 2*96 2.75 



99-69 10000 99-85 J.S.K. 101-10 GJ.D. 



Analysis III. was made under the direction of Mr. Whitney by Mr. 

 J. S. Kendall, and IV, by Mr. G. J. Dickinson. The formula of von 



Kobell for pectolite is 3Na Si-f 4Ca 3 Si 2 +3H.* 



The Stellite of Thomson, Mr. Whitney observes, was probably im- 

 pure Pectolite ; and he refers Thomson's Wollastonite to the same 

 species. 



5. On the Constitution of some Silicates containing Carbonic Acid, 

 Chlorine and Sulphuric acid ; by J. D. Whitney, (Pogg. Ann. der Ph. 

 und Ch., Jxx, 431.) — Mr. Whitney in this paper gives the results of 

 his examinations of the Sodalite and Cancrinite of Litchfield, Maine,t 

 besides analyses of Nosean or Spinellane, Haiiyne and Ittnerite. 



The Sodalite occurs with elaeolite in small cleavable masses of a 

 sapphire blue color. The analyses afforded, 



I. II. Calculated. 



Silica, 37-30 37*63 3760 



Alumina, ) 32 . 8g 30-93 31-57 



Peroxyd of iron, J 1*08 



Soda, 23-86 25-48 25-47 



Potash, 0-59 . . . . 



Chlorine, 6-97 . . 7-21 



whence we have the formula, deduced by von Kobell, 



• •• •• • 



Na 3 Si + 3A1 Si -f 



Nosean 



Silica 36-52, 



alumina 29*54, peroxyd iron 0*44, lime 109, soda 2312, chlorine 0-61, 

 loss by heating 1*37, sulphuric acid 7*66; giving the formula, 



• * * •»• * » • • 



Na 3 Si 4- 3AI Si -f Na S. 



For the Haiiyne from Albaner-gebirge, Mr. Whitney obtained i 

 Silica 32-44, alumina with a little water 27-75, lime 996, soda 14-24, 

 potash 2-40, sulphuric acid 12-98=99-77. Formula, 



. > * ****** * * • * 



~f 3 Al Si -f 



* 



Mr. Whitney's researches confirm the opinion of the identity of those mineral*, 

 ■suggested in ay System erf Mineralogy, p. 836. Mr. A. A. Hayes, in his anai m of 

 the^Bergen mineral, there quoted, obtained for its composition. Silica 55-90, lime 

 35*12, soda oT5, potash 0*60, alumina and maun a 0*08, protoxyd of manganese 

 0*64, Vater (hygrometii- ) 0-16 = 99-31. Frankenheim had stated that Pectolite 

 contained no water; but Mr. Whitney's analyses confirm the results of von Kobell. 

 —J. D. D. t This Journal, 2d Ser., i, 119, 1846. 



