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 . BAUERMAN COPPERMINES OF MICHIGAJT condary planes The finest crystallized varieties are as rule ob tained from the Ontonagon district and generally are more abundant in newly opened mines than in those which are worked at greater depths In the Porcupine Mountains to