Subject ASC0003u2g
The geological magazine, or, Monthly journal of geology.
n.s., decade 4, v. 5 (1898), Page 12 (1864)
Smithsonian Libraries
BHL Page 30745569
Keywords
Rapakivi granite (1/3 nat. size) a=orthoclase b=plagioclase The peculiar kind of "granite" known as rapakivi has typically a number of large phenocrysts commonly rounded or ovoid composed of a kernel of orthoclase enclosed within an envelope of oligoclase Rapakivi granite orthoclase plagioclase phenochrysts. rapakivi rock russia circle a b