This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
The Quarterly journal of the Geological Society of London . JUDD ON THE SECOXDA EY EOCKS OP SCOTLAND composed of hornblendic granite passing by insensible gradations into ordinary granite on the one band and into syenite granite on tbe other The normal character of this rock is that of an aggregate of white orthoclase and oligoclase