164 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
G. Olivine basalt, west peak of the Dardanelles, Alpine County. Hessose. De- 
scribed by Ransome in Bull. 89. Contains olivine, largely altered to iddingsite, pla- 
gioclase, serpentine, and augite. Analysis by George Steiger, record No. 1697. 
H. Mica separated from quartz monzonite, near Bloods station, Alpine County. 
Described by Turner in Am. Jour. Sci., 4th ser., vol. 7, p. 294. Analysis by William 
Valentine, record No. 1736. 
I. Typical diabase, 1 mile north of Bella Vista ranch houses, San Mateo County. 
Andose. Contains plagioclase, augite, olivine, apatite, ilmenite, and magnetite, with 
secondary serpentine, chlorite, iron ores, calcite, analcite, and natrolite. P. R. C. 
1473. 
J. Diabase, basaltic facies, Mendigo Hill, San Mateo County. Andose. Contains 
plagioclase, augite, olivine, ilmenite, and magnetite, with secondary calcite, serpen- 
tine, chlorite, iddingsite, iron oxides, analcite, and natrolite. P. R. C. 1603. 
Rocks I and J are described by Haehl and Arnold in Proc. Am. Philos. Soc., vol. 43, 
p.16. Analyses by E. T. Allen, record No. 1958. 
K. Bronzite-olivine aleutite, south end of Panamint Range. Andose. Contains 
plagioclase, bronzite, and olivine in a glassy to microcrystalline groundmass carrying 
much magnetite. 
L. Hornblende-quartz diorite, Fremont Peak, Mohave Desert. Contains horn- 
blende, plagioclase, subordinate quartz, and apatite, with secondary muscovite and 
epidote. 
M. Alaskite, Fremont Peak. Toscanose-tehamose. Essential minerals, quartz and 
orthoclase. 
Rocks K, L, M collected and described by J. E. Spurr. Hitherto unpublished. 
Analyses by W. F. Hillebrand, record No. 1881. 
