This copper crystal spinel twins are from the Empire Mine in the Mosquito Mining District, Copper Harbor, Keweenaw County, Michigan, USA. This piece is terminated on all ends and it consists of complex spinel twinned copper crystals. They are large, well defined and aesthetic. It can be displayed from all sides and angles. This piece measures 1 5/8 x 1 1/2 x 1 5/8 (tip to tip) and 1 1/8 at its’ widest point or 41 x 38 x 44 x 28 mm.