Siderite and Sphalerite epimorphs after Calcite

Item Description

Outstanding pseudomorph of Siderite and Sphalerite (as a mixture) replacing the original Calcite. The variety of replacement is an epimorph, where the later minerals have formed over and then casted the original crystal, which has now vanished and dissolved away leaving the hollow shell intact. The form is superb, and the color variations between terminations and faces, as well as the metallic luster on some of the crystals, creates a visual splendor and presence not often seen in something non-gemmy - especially in pseudomorphs! For the size, about the best you can ask for! This magnificent crystal, an amazing 7.3 cm long, has a small amount of matrix on the side and back, and it is accented by smaller crystals at the base. Very aesthetic. A true killer for its stark geometry! Valued $750