Roger Weller, geology instructor
firstname.lastname@example.org copyright 2010-R.Weller
copper sheet in rock-1
Keweenaw Peninsula, Michigan
In this specimen, a thin sheet of copper projects out of a rock. How did it
form? The rock came first; it was then cracked by tectonic forces. Copper
was injected into the thin, small opening formed by the crack. Later the rock
was exposed during the mining process and the two pieces of rock broke
away, leaving the sheet of copper that had filled the crack.
Photo is copyright free for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.