176 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
3. MISCELLANEOUS ROCKS. 
Rocks A to G, inclusive, were collected by G. F. Becker, who furnishes the petro- 
graphic data. A, B, C, D, and F are described by Becker in 18th Ann., pt. 3, p.7. 
Analyses by Hillebrand, record No. 1585. 
A. Augite-bronzite andesite, Delarof Harbor, Unga Island. Andose. Greenish 
black. Contains plagioclase, near labradorite, with much smaller proportion of 
augite and bronzite, in a groundmass of plagioclase, with a little glass and much light- 
green indeterminate material. 
B. Augite-bronzite andesite, St. Augustine Volcano, Cook Inlet. Placerose. Pur- 
plish gray. Contains labradorite, augite, and bronzite in a groundmass of plagioclase 
and magnetite. 
C. Quartz porphyry, bed of Bear Creek, 4 miles from its mouth, Turnagain Arm, 
Cook Inlet. Dacose. Resembles D, with more feldspar and less quartz. 
D. Quartz porphyry, east of mouth of Indian River, Sitka, BaranofIsland. Sitkose. 
Contains plagioclase, quartz, a little pyroxene, and some carbonaceous matter, with 
secondary quartz, calcite, and muscovite. 
E. Diorite, head of Captains Bay, Unalaska Island. Tonalose. Contains plagio- 
clase, biotite, hornblende, chlorite, magnetite, and sometimes tourmaline. 
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F. Diorite, Karluk Cliffs, Kadiak Island. Bandose. Contains labradorite and 
hornblende, with subordinate quartz, biotite, and magnetite. 
G. Diorite, Lane & Hayward mine, Silverbow Basin. Shoshonose. Contains 
plagioclase, biotite, hornblende, and scattering grains of quartz, with secondary 
chlorite, epidote, and muscovite. 
H. Hornblende andesite, Bogoslof Island. Andose. Described by Merrill in Proc. 
U.S. Nat. Mus., vol. 8, p. 31. Contains hornblende, augite, p'agioclase, tridymite, 
grains of iron ore, a little apatite, and probably sanidine. P. R. C. 315. 
I. Like H, but darker colored. Andose. Contains more hornblende, no glass, and 
little or no tridymite. Same locality, also described by Merrill. Analyses H and 
I by T. M. Chatard, record Nos. 209, 210. P. R. C. 316. 
