Up close, this specimen has a lot going for it. Nests of spinel twins, to .5 cm in length along with modified cubes to.25 cm across, cover a matrix of white calcite. Cubic silver crystals are very rare in nature and this is the only one I have from this locale. A few matte black acanthite crystals, to .2 cm across are also present. This specimen can be displayed on more than one angle. Superb for complexity and crystal habits!