422 Dr. Genth’s Contributions to Mineralogy. 
Silicie acid, - - - : 5874 p.c. 
Alumina, - - : - ee a bi iy 
Sesquioxyd of iron, + : : ots °* 
Lime, - - - - - T3l ¢ 
Soda, . - - - - 506. -* 
Potash, - - - : - Ore" 
ater, - - - - - 144 7? 
100-23 
I am indebted to W. F. Harris, Esq., who had the advantage 
of Prof. C. U. Shepard’s own mineralogical determinations for a 
pane specimen of what the latter in his report on the Canton 
ine calls Plumbo-Resinite. It forms as Prof. Shepard remarks, 
a 
metallic taste, and contains oxyd of copper and sulphuric acid. 
It does not contain either alumina or oxyd of lead, and with a 
solution containing nitric acid only a very slight yellowish color 
could be produced by molybdate of ammonia. 
9. Cherokine (Shepard) is Pyromorphite. 
By the kindness of F. W. Harris, Esq., I have received a gen 
uine specimen of Prof. Shepard’s Cherokine. As he stated m 
his report on the Canton Mine, “zt resembles white lead ore (carbo- 
nate of lead) in its color, but possesses the crystalline form of pyto- 
morphite, while it contains phosphate of alumina and oxyd of 2ne 
and further differs from Plumbo-Resinite by containing much less 
water,” etc. Some qualitative tests which I have made with a 
_ crystal of the mineral gave me very different results, and I have 
not been able to distinguish it from pyromorphite. A spec: 
search was made for water, alumina and oxyd of zine, but neither 
were found. Before the blowpipe also it behaves like py? 
ah st and melts easily, the globule assuming on cooling 4 
polyhedral form. 
10. Vivianite. 5a 
Mr. C. A. Kurlbaum, Jr., (analyses I and Il) and I (II) have 
examined a massive indigo-blue variety of vivianite from Allen- 
‘town, Monmouth county, N.J. 0; Secige grige ye SC * 8 
Sa ge 
