102 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
The following Cripple Creek rocks, M to Y, are described in P. P. 54, mainly by 
L. C. Graton. 
M. Granite, Ajax mine. Contains microcline, oligoclase, quartz, biotite, and 
apatite. ; 
N. Altered granite adjacent to M. Contains quartz, potash feldspar, fluorite, and 
pyrite. Described as an ore. Descriptions of M and N furnished by F. L. Ran- 
some. 
O. Biotite trachyte, Portland mine. Phlegrose. 
P. Syenite, Portland mine. Monzonose. Contains pyroxene, plagioclase, ortho- 
clase, hornblende, apatite, magnetite, and titanite. 
Q. Latite-phonolite, Portland mine. ssexose. Contains pyroxene, plagioclase, 
orthoclase, hornblende, analcite, nosean, sodalite, apatite, magnetite, and titanite. 
R. Latite-phonolite, 3,300 feet 10° east of south from Bull Cliff. Esserose. Con- 
tains pyroxene, plagioclase, orthoclase, hornblende, nosean, analcite, apatite, magne- 
tite, titanite, sodalite, and secondary zeolites. Analyses M to R by W. F. Hille- 
brand, record No. 2132. All contain traces of lithia. 
8. Latite-phonolite, Portland mine. Akerose. Contains pyroxene, plagioclase, 
orthoclase, magnetite, apatite, and very little sodalite. 
T. Latite-phonolite, Anaconda mine. <Akerose. Contains pyroxene, plagioclase, 
orthoclase, magnetite, apatite, titanite, hornblende, sodalite, analcite, and a little 
biotite. Analyses 8, T by G. Steiger, record No. 2152. 
U. Trachydolerite, Isabella dike. Akerose. Contains plagioclase, pyroxene, 
olivine, orthoclase, analcite, apatite, magnetite, biotite, and hornblende. 
V. Vogesite, Jennie Sample mine. Monzonose. Contains orthoclase, hornblende, 
pyroxene, biotite, plagioclase, brown mica, iron ores, rare apatite, some analcite, and 
often olivine. 
W. Monchiquite, Block 8 mine. Ourose. Contains pyroxene, olivine, analcite, 
biotite, apatite, magnetite, and alteration products. Analyses S to W by W. T. 
Schaller, record No. 2171. 
