F. A. Genth’s Contributions to Mineralogy. All 
Silica, ‘ 46°87 
Alumina, 25°32 
ime, 13°80 
Soda, : 0°45 
Potash, - 01 
Water, 13-46 
4. Owenite identical with Thuringite. 
In a previous paper (Am. Journ. Sc., 2d Series, vol. xvi, p. 
165), I described a mineral from Harper’s Ferry, Va., under the 
name ‘‘Owenite”’ as new, remarking, however, that the difference 
between it and Thuringite could be detected only by a chemical 
examination. Iwas unable at that time to obtain any genuine 
Thuringite for a comparative analysis, and, I must confess, I ha 
too much confidence in Prof. Rammelsberg’s analysis, to think it 
would need a repetition, since the difference was about 16 pr. ct. 
of alumina. In the meantime Prof. J. L. Smith, (Am. Journ. 
Sc., 2d Series, vol. xvi, p. 131), announced the identity of Owen- 
ite and Thuringite, but, the material for his analysis, as he told 
’ me, having been slightly altered by oxydation, it was desirable 
to reéxamine the fresh mineral. Jos. A. Clay, Esq., with the 
greatest liberality permitted me to take from his specimen a suffi- 
cient quantity for analysis. The original label of Dr. Krantz of 
nn, which was still with it, gave the locality ‘“ Schmiedeberg 
near Saalfeld in Thuringia.” The material for the following 
analyses made by Mr. Peter Keyser, was not in the least degtee 
altered, and the results, which he obtained show the identity in 
composition of Thuringite and Owenite, which latter name I 
therefore withdraw. For comparison I give besides the analyses 
of the Thuringite from Schmiedeberg also that of the same min- 
eral from Harper’s Ferry, Virginia (the Owenite). 


de TE Pane EV, « i 
<estcisinnarianttancnnssinsisit—ateamaapeccett NS —_—_o FT 
ei F Schmiedeb From Harper’s Ferry. 
i (Owenite.) 
lea, : . 2436 23:09 2319 23° 
Alumin, . . 15°69 15°86 15°34 ue 
Sesquioxyd of iron, 13°08 14°31 14:03 3° 
: 9 58 
Protoxyd of iron, . 34:20 me 
Lie ' , 126 1:29 1:87 i 
i . 0:00 
Bors : . 0°00 0-00 re pL 
Potash: : \ trace trace re 
Water, See 10°57 1059 
(To be continued) =. '* 
