Bullseye! The copper has faithfully replaced the quartz bands in the lower half of the agate.

Not all copper agates are found at the Wolverine #2 Mine or the Kearsarge mines. The one on the left is from a beach on Sedar Bay in Keweenaw County, MI. The copper crystals on the upper left are striking. The rich pink

color is probably caused by the reddish copper oxide, chalcotrichite. It's in the Wayne Sukow collection.

A second copper agate from a beach on Sedar Bay. Here the copper appears as large fronds. It's another rare agate. It's also in the Wayne Sukow collection.