MINERALS, 261 
HYPERSTHENE. 
A. From the basalt of Mount Thielsen, Oregon. Incomplete analysis by T. M. 
Chatard. 
B. From gabbro, SE. } sec. 20, T. 65 N., R. 4 W., Minnesota. Described by 
Bayley in Jour. Geology, vol. 3, p.1. Analysis by E. A. Schneider. 
C. From the augite andesite of the Tokajer-Berg, Hungary. Analysis by W. F. 
Hillebrand. Sp. gr., 3.495 at 25°. 
D, E, F. Three specimens separated from the hypersthene andesite of the Buffalo 
Peaks, Colorado. Described by Cross in Bull. 1. Analyses by W. F. Hillebrand. 
In D and E alkalies were disregarded. In E and F all the iron is given as FeO. 
Sp. gr., of F, 3.307 at 23°. 
fc PYROXENE. 
A. Diopside separated from the websterite of Hebbville, Maryland. Described by 
G. H. Williams, Am. Geologist, vol. 6, p. 35. Analysis by T. M. Chatard. 
B. Diopside from the leucite rocks of the Leucite Hills, Wyoming. Described by 
Cross, Am. Jour. Sci., 4thser., vol. 4, p.115. Sp.gr.,3.290 at 20°. Analysis by W. F. 
Hillebrand. 
C. Pyroxene from Moriah, New York. The source of associated serpentine. Analy- 
sis by Charles Catlett. 
D. Dark-gray pyroxene, Montville, New Jersey. The source of associated serpen- 
tine. Analysis by Charles Catlett. 
15619—Bull. 419—10-—_18 
