Dr. Genth’'s Contributions to Mineralogy. 415 
Apr. XL.—Contributions. to Mineralogy; by Dr. FREDERICK 
“Ge A, GENTH. 
SINCE my last contribution to Mineralogy, (Am. Journ. of Sci., 
xix, 15,) I 5 Bei examined a number of minerals, the constitution 
of which appeared noi to be satisfactorily settled, and in the fol- 
wing pages, give the results of my examinations. 
1, Bismuthine from Riddarhyttan in Sweden. 
The frequent occurrence of tellurium in minerals containing 
bismuth and the probability that both metals can replace each 
other, induced. me to examine a specimen from Riddarhyttan. 
e bismuthine i is implanted in actinolite, the crystals of which 
often penetrate it, hay is associated with chalcopyrite and allan- 
ite (cerine), and by its broadly foliated structure and perfect 
cavage somewhat resembles the tetradymite from Fluvanna 
County, Va. It was found to contain; 
ulphur, - : 1819 p. ¢ 
Ee ane wa a cack of tiecuitn, - - - 0 
After deducting the actinolite and 1:12 pc. of chalcopyrite, 
the percentage of the Le mineral would be: 
Sulphur, = - . - : 18-65 p.c. 
se, = gen es 
ismuth, - * : . as : 
10000 
m this analysis it appears, that the general formula for bis- 
muthine should be written (Bi, Te)S:. 
2. Harrisite (Shepard), a pseudomorph of Copper-glance after Galena. 
Prof. QO. U. Shepard describes in his Report on the Canton 
ae (Savannah, 1855, and 2d edition, New Haven, 1856), under 
& ame Harrisite, as a new species an interesting pseudomorph 
eoppe r-glance after 
er rege eee the Canton mine and collected 
sof the material and data for the followin Hilger 
am also indebted to Dr. W. C. Daniell, Prof. Julien eby 
W.F. minerals from this mine. 7 
og the 115 foot east level of the Canton mine, the Harrisite 
Was found in a vein-like pocket, which dipped at an angle of 
about 30° to wards the east, in the ore stratum, and exte ed as 
this the 
HC pear ns re — 
