40 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
TENNESSEE. 
Gabbro, 2 miles south of Limestone Cove, Unicoi County. Camptonose. Col- 
lected by Arthur Keith, who furnishes the petrographic data. Analysis by W. F. 
Hillebrand, record No. 1707. Contains hypersthene, plagioclase, and magnetite. 
MISSOURI. 
Rocks A to D, granite and porphyry, 6 miles east of Ironton. Described by Ha- 
worth in Missouri Geol. Survey, vol. 8, Annual Report, pp. 140, 180, and 213. Anal- 
yses by W. H. Melville, record No. 1206. 
A, B. Granite. A, P. R. C. 1027; B, P. R. C. 1028. 
C, D. Porphyry. ©, P. R. C. 1029; D, P. R. C. 1030. 
Rocks composed principally of orthoclase and quartz, with some microcline, plagi- 
oclase, and biotite, and minor accessory minerals. A is toscanose; B, C, and D are 
liparose. 
E. Devonite, Mount Devon. Hessose. Collected and described by A. Johannsen. 
Contains phenocrysts of a plagioclase rich in potassium. The groundmass consists 
of feldspar and augite, with titaniferous magnetite and chlorite. Analysis by W. F. 
Hillebrand, record No. 2350. 
a little 
2? 
trace? 
99.32 | 100.17 | 100.04 | 99.81} 100.32 
2 Equivalent to 0.07 §. Assumed to be pyrite, no pyrrhotite being present. 
