MINERALS. 265 
B. Tremolite, found in the serpentine of Easton, Pennsylvania. Analysis by 
L. G. Eakins. 
C. Actinolite (?), Corundum Hill, North Carolina. Sp. gr., 3.062. Analyzed by 
T. M. Chatard and described by him in Bull. 42. 
D. Nephrite, New Zealand. Fragment from a dark-green bowlder. Analysis by 
F. W. Clarke. 
E. Nephrite, Robenhausen, Lake Pfiffikon, Switzerland. Part of a green, com- 
pact, highly polished jade implement. Sp. gr., 3.015; determined by William 
Hallock. Analysis by F. W. Clarke. 
H20 above 100° 
CO. 
F. Dark-green nephrite implement, from the Eskimo of Point Barrow, Alaska. 
Sp. gr., 3.012. Analysis by F. W. Clarke. 
G. Nephrite adze, Point Barrow. Nearly black, with grayish-green patches. 
Sp. gr., 2.922, Hallock. Analysis by F. W. Clarke. 
H. Nephrite adze, Cape Prince of Wales, Alaska. Dark green, laminated in two 
shades, opaque. Sp. gr., 2.989, Hallock. Analysis by F. W. Clarke. 
I. Worked nephrite, St. Michael, Alaska. Dull apple green, fairly uniform in tint, 
semitranslucent at edges. Sp. gr., 3.006, Hallock. Analysis by F. W. Clarke. 
J. Jade implement, Diomede Island, Alaska. Dark green, laminated in two shades, 
opaque. Sp. gr., 3.010, Hallock. Analysis by F. W. Clarke. 
Ignition. . 1.02.2... 
Alkalies... 
99.90 | 99.81 | 100.35 | 99.26] 100.10 
K, L, M, N. Four samples of nephrite, found in place by Lieutenant Stoney, 
U. 8. Navy, near the Kowak River, Alaska. K, greenish gray, splintery-lamellar. 
L, like K, but more granular. M, paler, nearly white, closer grained. N, brownish, 
highly foliated. Analyses by F. W. Clarke. Ferrous iron determinations by R. B. 
Riggs. O, nephrite from Jordansmihl, Silesia; analysis by George Steiger; typical 
