800 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
IX. COLUMBO-TANTALATES. 
SAMARSKITE. 
Mineral near samarskite, from Devils Head Mountain, near Pikes Peak, Colorado. 
Analyzed by W. F. Hillebrand and described in Bulletin 55. 
A. Pitch-black variety, streak dirty brown. Sp. gr., 6.18 at 22° 
B. Black, streak salmon colored. Sp. gr., 6.12 at 25° 
C. Altered variety. Sp. gr., 5.45 at 16°. 
@ With TiOs. b Or 0.74 UOs, 
X. BORATES. 
COLEMANITE. 
A. Transparent crystal, ordinary type, Death Valley, California. 
B, C. Bladelike crystals, Death Valley. 
D. Priceite, Curry County, Oregon. 
E. Pandermite, Island of Panderma, Black Sea. 
Analyses by J. E. Whitfield, with details in Bull. 55. 
