116 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
F. Granite, Platte Canyon. Alaskose. Described by E. B. Mathews in Bull. 150, 
p.172. Contains microcline, quartz, biotite, oligoclase, and fluorite. Apatite, zircon» 
magnetite, hematite, limonite, epidote, and rutile (?) are sometimes present. Analysis 
by H. N. Stokes, record No. 1314. 
G. Rhyolite, east bank of Arkansas River, Nathrop. Liparose. Described by 
Cross in Proc. Colorado Sci. Soc., vol. 2, p. 69. Contains quartz and sanidine in a 
groundmass mainly of quartz and alkali feldspar. This rock carries topaz and spes- 
sartite in its lithophyse. Analysis made by L. G. Eakins in the Denver laboratory. 
Sp. gr., 2,602, 29° P. R. C. 598. 
H. Hornblende porphyrite, Hermano Peak, Sierra El Late. Lassenose. Described 
by Cross in 14th Ann., p. 165. Contains plagioclase, hornblende, rare quartz, and a 
little biotite. Analysis by W. F. Hillebrand, record No. 1429. 
I. Hornblende porphyrite, Ute Peak, Sierra El Late. Tonalose. Described by 
Cross in 14th Ann., p. 165. Contains plagioclase, hornblende, and very little augite, 
in a groundmass of quartz, orthoclase, and plagioclase. Analysis by Hillebrand, 
No. 1429. 
J. Porphyritic augite diorite, Lone Cone, San Miguel Mountains. Tonalose. De- 
scribed by Cross in 14th Ann., p. 165. Contains plagioclase, augite, hornblende, and 
biotite, in a groundmass of quartz, orthoclase, and plagioclase. Inclusions of mag- 
netite and apatite in the augite. Analysis by Hillebrand, No. 1429. 
G H. I J. 
ISH Oa ese asia vs svete tcc in aa Sos ayas Ruavanseceegayacais wis ales hartaaialdrasen Maree matinee 69.89 | 62.65 | 59. 42 59.19 
PUB Bos checssbie arrescinceseniaoreted minieie Ub ein nce aida So wee rcbwie siete aectolatoseid n'a ata 17.94 | 16.68] 16.79 18.00 
CBO 8 eho psesie alk ecclechte acd cope Gre red terete Sh rciern faraies ermaencemteiadeaineve veces Se creeps vce cme 3! 2.35 3. 23 3.07 
FeO. 52 2.63 3. 29 2.32 
MgO 14 1. 43 2.24 1.41 
CaO. trace 4. 96 5. 57 6.55 
Naa scicas 4.21 4.45 4.15 4.01 
KO! sc cic wisi ? 4. 38 2.75 2. 82 2.74 
H20 at 100°...........-.-- eae sists Soe Seis 2.0 227 227 46 
H20 above 100°... ........ ee oe ce Raa aLO AIO \ 07) 766) 279! 1106 
1 O)'o ie mecca cieine & a or pares aiatvencim ajejaiatera stents [are einral opie. ~ 42 - 68 - 58 
PaO isiseicrcsarencisierd trace - 23 35 .29 
MnO.......... 23 .16 -13 -19 
SEO ata tio ciatsicisiecsteinym arcisratusldiasnecd slaveiaranersiend vaiemeacestacaiels sleeve humor aeons wee ad | sade.iee pak -07 +13 
BAO: seecteacicrutes seins sacinat dardania da cerensen davdenia gs oh See acs nade can [aazeciaas 113 14 .18 
DO wammmaurate teeny antennas x eRe Ne ehES as Ladue hmpinkavndnbmevnnwancaad trace | trace | trace trace 
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