Bornite pseudo after Chalcocite    Levant Mine, St. Just, Cornwall, England.  Ex. Paul and Dawne Dunning Collection.  This is a really fine classic thumbnail specimen measuring 2.3 x 1.5 x .9 cm.  It is composed of two attached tabular twins having a nice metallic luster and gun metal blue color.  They are nicely formed and had only one very tiny attachment point where some white putty remains.  It is very rare for specimens like this to be available and they are always pricy.  Outstanding piece!  $800