Bulletin No. 262 
n • /D, Petrography and Mineralogy, 32 
5eries \B, Chemistry and Physics, 46 
DEPARTMENT OF THE INTERIOR 
UNITED STATES GEOLOGICAL SURVEY 
CHARLES 1). WALCOTT, Director 
CONTRIBUTIONS TO MINERALOGY 
FROM THE 
UNITED STATES GEOLOGICAL SURVEY 
BY 
F. W. CLARKE, W. F. HILLEBRAND, F. L. RANSOME, S. L. PENFIELD, WALDEMAR LINDGREN, 
GEORGE STEIGER, AND W. T. SCHALLER 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1 9 5 
