Reétzamination of American Minerals. 371 
33. Kyanite. 
Associated with the lazulite just described, is a very beautiful 
white kyanite. Its composition is 
Silica, ‘ Z - = . Fi : 87°60 
Alumina, . ; ‘ : i : 6040 
Peroxyd iron, 
160 
99°60 
This corresponds to the formula 41° $= silica 37-47, alumina 
62:53. 
34. Fleolite. 
The Eleolite of Magnet-Cove in Arkansas, passed under the 
name of “ flesh red feldspar” until recognized by Prof. Shepard.* 
It has the following physical and chemical properties. Hardness 
Sp. gr. 2°65. Color flesh-red. ‘ Lustre greasy. Structure 
massive. Chemical composition, 
Silica, : 4446 
Alumin - : ; ; 30°97 
Peroxyd of iron, : : : . 2-09 
Lime, ; ‘ ; , ; 066 
Soda, : . ‘ ; 15°61 
Potash, : : ‘ 4 ; 591 
Tgnition, : ; : : 0°95 
100°65 
From this we have the oxygen ratio for the silica, peroxyds, and 
protoxyds, 9: 6 : 2, and the formula R?Si+ 218i. The mineral 
examined, was furnished by Mr. Markoe of Washington; it is 
the one alluded to in our last paper, as containing the compact 
Thomsonite, under the name of ozarkite. Since publishing the 
analysis of the latter, we have procured a specimen of the eleolite 
containing the Thomsonite in handsome radiated erystallisations. 
35. Spodumene. 
Several analyses of this species from Norwich and Sterling, 
Mass., were given by Mr. Brush in vol. x, of this Journal. 
In these analyses, the alkalies were determined as sulphates, 
and from the amount of sulphuric acid, the relative amount of 
alkalies was calculated. Since these examinations, it has been 
analyses referred to, are erroneous. The method used in this in- 
* This Journal, [2] ii, 252. 
