Siderite and Sphalerite epimorphs after Calcite

Item Description

An excellent pseudomorph of siderite and sphalerite (as a mixture) replacing the original calcite crystals. 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 fine, 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, this is outstanding. Very aesthetic with fine geometry.