332 



Spudumeiie and its Alterations. 



material mentioned above, in order to establish its uniformity 

 of composition, notwithstanding its pseudomorplious origin. 



The following analyses were made upon materials from the 

 two localities found in Goshen. 



XI — Cymatolite from the more easterly locality, N. W. of 

 Goshen Centre. 



Common wavy and yellowish material, in part finely granu- 

 lar, in irregular pseudomorplious prisms, generally stained by 

 Pyrolusite. The material was only with difficulty selected in 

 sufficient purity for analysis. It resembled that of the Chester- 

 field locality. 



XII — Cymatolite from the Barrus farm, west of the foregoing. 

 The micaceous and brilliant rare white variety (Aglaite), in a 

 perfectly pure state. 



XIII — Cymatolite, average composition, as deduced from all 

 my preceding analyses (VIII, IX, X, XI, and XII), on the 

 material obtained from the three localities in Chesterfield and 

 Goshen. 



Silica, 



Alumina, 



Ferric Oxide, 



Manganous Oxide, 



Cobaltous Oxide, 



Magnesia, 



Lime, 



Lithia. 



Soda, 



Potassa, 



Nitrogenous } 



Organic matter, f 



Water, 



XI 



Goshen. 



Wavy Yellow 



Cymatolite. 



58.51 



21.80 



.85 



.29 



trace 



1.44 



.81 



.19 



6.88 



6.68 



.41 



1.96 



XII 



XIII 



Goshen. 

 Aglaite. 



Average of 

 all analyses 

 of Cymatolite. 



58.11 



58.70 



24.38 



23.09 



1.66 



1.46 



.18 



.24 



.75 



.64 



.48 



.62 



.09 



.17 



2.57 



6.75 



8.38 



5.87 



.43 



.45 



2.58 



2.02 



99.88 



99.61 



100.01 



