Cubanite has a similar chemical composition to chalcopyrite, it is an iron and copper sulphide, and it shows a weak magnetism, a property that chalcopyrite does not have. In this classic Canadian deposit, it usually occurs in cyclical twins. In the main crystal of this specimen we can observe this twinnig, with a developed, almost tabular, prism; very unusual. On a matrix with calcite. The main crystal is: 0,8 x 0,6 x 0,3 cm. 0,32 x 0,24 x 0,12 In.