IGNEOUS AND CRYSTALLINE ROCKS. 89 
the two latter being the chief minerals. Some zeolites and analcite are also present. 
E. B. Hurlbut, analyst. P. R. C. 356. 
L. Fergusite, head of Shonkin Creek. Fergusose. Contains augite, olivine, biotite, 
iron ore, apatite, orthoclase, nephelite, zeolites, and traces of serpentine, limonite, 
and kaolin. Contains pseudomorphs after leucite. E.B. Hurlbut, analyst. P.R.C. 
1502. 3 
M. Monzonite, Highwood Peak. Shoshonose. Contains augite, biotite, iron ore, 
apatite, plagioclase, and alkali feldspar. E. B. Hurlbut, analyst. P. R. ©. 1503. 
N. Syenite, Middle Peak. Borolanose. Contains augite, olivine, biotite, iron 
ore, apatite, plagioclase, and orthoclase. The two latter, with augite, are thechief 
minerals, E. B. Hurlbut, analyst. P. R. (. 1504. 
2.25 - 63 35 
23 .13 47 
18 33 21 
trace | trace trace 
-07 -14 
- 30 34 42 
trace - 03 02 
-05 | trace 24 
100.14 | 99.60! 100.03 
OT | ce icsesiciese -06 
MOO) US | scence 99. 97 
O. White syenite of the Shonkin Sag laccolith. Borolanose. Partial analysis. 
P.R. C. 1505. 
P. Shonkinite, Shonkin Sag laccolith. Montanose. Contains augite, olivine, 
biotite, and orthoclase. P. R. C. 1506. 
Rocks O, P, described by Weed and Pirsson in Am. Jour. Sci., 4th ser., vol. 12, p.1. 
Analyses by W. F. Hillebrand, record No. 1885. 
K20....20201. 
HO at 105°... 
99. 18 99. 99 
@ Includes TiOs and P05. bLoss on ignition, 
