178 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
Q. Plagioclase-scapolite-biotite rock, Skwentna River, 12 to 15 miles above its 
mouth. Tonalose. Dike. Described by Spurr in Am. Jour. Sci., 4th ser., vol. 10, 
p. 310. Essential constituents andesine-oligoclase, scapolite (dipyre), and biotite, 
with accessory apatite and zircon. P. R. C. 1273. 
R. Tonalite-aplite or yukonite. Yukonose. Yukon River, above Fort Hamlin. 
Hitherto undescribed. Consists essentially of quartz and soda-lime feldspars. 
2 
B20 at 110° 
a Whether § or SOg was not determined. 
BRITISH COLUMBIA. 
Peridotite, junction of Eagle Creek and Tulameen River, Yale district. Dunose. 
Described by J. F. Kemp in Bull. 193. About two-thirds olivine and one-third 
serpentine, with some magnetite, calcite, and magnesite as accessories. Analysis by 
W. F. Hillebrand, record No. 1930. P. R. C. 1472. 
TiO2, ZrOz, BaO, SrO, and LizO were absent. 
HAWAIIAN ISLANDS. 
Rocks collected by Whitman Cross, who supplies the petrographic data. Analyses 
by W. F. Hillebrand, record Nos. 2038, 2112. A and B are described by Cross in 
Jour. Geology, vol. 12, p. 510. 
A. Trachyte, from Puu Anahulu, North Kona, Hawaii. Umptekose. Consists 
chiefly of alkali feldspar, with small amounts of diopside and obscure sodic amphi- 
boles or pyroxenes. Analysis incomplete. 
B. Trachyte, from Puuwaaraa, North Kona, Hawaii. Umptekose near nordmarkose. 
Black glass, containing alkali feldspar microlites and ferritic particles. 
C. Basalt, crater of Haleakala, Maui. Essexose. Contains plagioclase, orthoclase, 
nepheline, augite, much less olivine, magnetite, and apatite. 
D. Plagioclase basalt, Makaweli Canyon, Kauai. Auvergnose. Consists essentially 
of augite, olivine, plagioclase, and magnetite, with a little glassy base. 
