Subject ASC0003tjp
The geological magazine, or, Monthly journal of geology.
Decade 3:v. 10 (1893), Page 442 (1893)
Smithsonian Libraries
BHL Page 30553958
Keywords
diorite geology Microscopic Wady Halfa Nile felspar granite biotite pyroxene hornblende Wady Halfa plagioclase plagioclase twinning contact alteration africa geology of africa felstone nile second cataract of the nile geology of africa felstone instrusive in diorite