42 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
@ Including CrzO3. 
E. Phonolite, hill between Black and Big mountains, Uvalde quadrangle. Laur- 
dalose. Contains sanidine, nephelite, and egirite, and very little brown hornblende, 
augite, and magnetite. Sp. gr., 2.559, 19.5° P. R. C. 1070. 
F. The portion of E soluble in 1:40 dilute nitric acid. 
G. Nepheline basalt, Tom Nunns Hill, Uvalde quadrangle. Uvaldose. Contains 
olivine, augite, nephelite, magnetite, and apatite. Sp. gr.,3.148,19°. P.R.C. 1065. 
H. The portion of G soluble in 1:40 dilute nitric acid. 
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