A ~9000 lb copper boulder likely represents a fragment of a vein of copper which was sheared by a moving glacier and carried along its base before depositing it 9-10 thousand years ago. This boulder was donated by Joseph Lizzadro  and has been on display for decades near the Keweenaw NHP headquarters. Many similar boulders have been found in the Keweenaw. The boulder is mainly native copper, and the green minerals on its surface are malachite and cuprite.