Carrolite This mineral may look like hematite at first glance. However Carrolite, Cu(Co,Ni)2S4 (Copper Cobalt Nickel Sulfide), is gray metallic Sulfide mineral containing a rich mixture of Copper, Cobalt and Nickel. It forms crystals, some very large, in hydrothermal veins. It a rare mineral, found recently in Africa and takes the shape striking octagonal crystals. These crystals are nestled amongst white calcite crystals. Carrollite is very good at replacing fear with love. This crystal also provides a great deal of help during recovery from an illness.