GO CONTRIBUTIONS TO CHEMISTRY AND MINERALOGY. [bull. 167. 
at the end the forms 111 and 110. The measurements compared with the correspond- 
ing ones of sylvanite are as follows: 
Sylvanite. 
lllA(lll) over twinning plane 93° 35' 94° 30' 
HOA(llO) over twinning plane 35 2 34 43 
110A111 36 35 37 3 
110A111 in twin crystal 36 33 37 3 
Other forms which were measured could not be referred to the sylvanite axes, and 
it seems probable from their development and lack of symmetry that the crystals 
are triclinic; but no satisfaction was obtained after a long and careful study of the 
limited supply of material on hand. 
In conclusion therefore it may be stated that the crystals are probably triclinic, 
but near sylvanite in angles and axial ratio. 
Note. — Since the foregoing work was completed additional analy- 
ses of Cripple Creek tellurides have been made by Profs. A. H. 
Chester 1 and W. H. Hobbs. 2 From the crystallographic data they 
were able to obtain it would appear that neither of the minerals exam- 
ined by them can be identical with calaverite, though both possess 
the same general formula MTe 2 , in which, however, the ratio of gold 
to silver was not at all alike. The analysis of that one, which by its 
crystallographic features was identified as krennerite, has even less 
silver than the specimens of calaverite from the C. O. D. mine, while 
goldschmidtite, showing crystallographic relations with sylvanite, con- 
tains 8.95 per cent Ag to only 31.41 per cent Au, thus supporting, in a 
measure, Mr. Pearce's belief in the existence at Cripple Creek of a 
telluride much richer in silver than calaverite. 
2. Tellurides from California. 
In a suite of tellurides from the Mother Lode region in California, 
collected by Mr. F. L. Ransome, of the United States Geological Sur- 
vey, I have been able to identify a nickel telluride (melonite?), a mercury 
telluride (coloradoite?), besides petzite and hessite. 
Melonite?. 
Several specimens from the old Stanislaus mine, 3 the original source 
of Genth's melonite 4 (Ni 2 Te 3 ?), but now included with the Melones and 
1 On krennerite from Cripple Creek, Colorado. A_m. Jour. Sci., 4th series, Vol. V, 1898, p. 375. 
2 Goldschmidtite, a new mineral. Am. Jour. Sci., 4th series, Vol. VII, 1899, p. 357. 
3 Mr. Ransome has kindly furnished the following notes: This mine is situated on the south slope ot 
Carson Hill, Calaveras County, just ahove Robinsons Ferry, and has not been worked for several 
years. There is no prominent vein at this point, the ore being very irregularly distributed, and 
occurring in small, nearly horizontal, stringers in dark clay slates of Carboniferous age, with nearly 
vertical dip. This mine has long been known as a source of interesting tellurides, and Dana, in the 
sixth edition of his System of Mineralogy, cites petzite, calaverite, melonite, and altaite as occurring 
here. The other ore minerals are pyrite and galena, the latter in small quantities. The ore-bearing 
stringers are filled with quartz, or a mixture of quartz and calcite as a gangue. The rich masses of 
tellurides appear, however, to be usually associated with calcite (or dolomite). The melonite of 
specimen No. 16, shows at least one perfect cleavage, resembling in the thinness of the resulting 
laminae the cleavage of the micas. The cleavage faces are usually somewhat curved, and possess a 
splendent metallic luster. The cleavage can best be detected by carefully scraping thin folia from 
such a brilliant surface with a sharp knife point. The color of the cleavage faces is pale bronze 
yellow. 
4 Long o, accented (mel-y-nite). 
