On the other hand, Mr. Strutt's analysis of granite affords strong support to the view that the radium it contains is of terrestrial origin. The concentration of this constituent in the biotite ...

The Journal of Geology, Vol. 33, No. 5 (Jul. - Aug., 1925), pp. 467-487 (21 pages) This paper is a summary of the petrography and petrology of the largest granite batholith in Minnesota. The granite ...

For geologists, a continent is a large area of thick continental crust composed of granite or similar igneous rocks, forming the continental base, in combination with metamorphic rocks ...

“We were a bit puzzled when we found it.” The mass of granite likely formed from unerupted lava cooling below the ancient volcano. It’s radioactive, probably because it contains uranium and ...