This is an incredible striated scalenohedron included with a mass of bright copper that grades and thickens into a matrix of copper upon which the crystal rests. Rarely do you find such a combination where the calcite is this clear, or the copper visible in such detail inside, AND where the calcite is pristine and complete all around. This is an absolute killer, and one of the gems of the collection. It is much much better in person, even! 4.2 x 2.7 x 2.4 cm