248 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
Mg.. 
O, F, and soluble SiOz by difference 
99.88 | 100.47 | 100.00 
a Calculated from Fe to make FeS.. b As MnO2? 
MELONITE. 
From the Melones mine, Carson Hill, Calaveras County, California. Collected by 
F.L. Ransome. Analyzed by W. F. Hillebrand and described by him in Bull. 167. 
Three samples. Sp. gr. of B, 7.72 at 22.5°, which is probably too high for the pure 
NiTe,. Sample C is the purest. = 
TETRADYMITE. 
From near Whitehorn, Fremont County, Colorado. Sp. gr., 7.816 at 20°. Analysis 
by W. F. Hillebrand. 
GOLDFIELDITE. 
A new mineral, collected by F. L. Ransome, at Goldfield, Nevada, and analyzed by 
Chase Palmer, has been named goldfieldite. The analysis is only preliminary, for 
the material was too scanty to admit of the most thorough work. Described by Ran- 
some in P. P. 66, p. 116. 
