Siderite, Sphalerite
Aggenys Mine, Northern Cape Province, South Africa
Cabinet, 14.7 x 11.0 x 4.5 cm
An outstanding pseudomorph of Siderite and Sphalerite replacing the original Calcite. This 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. This reminds one of the great old-time, Hemimorphite pseudomorphs from Missouri, but with sharper crystals yet. The largest crystal in this magnificent plate is an amazing 6.5 cm long. A fabulous specimen, dramatic in appearance, from a major find. Ex. Charlie Key.