Abundant, black, microcrystalline plattnerite and equally abundant yellow, microcrystalline mimetite on a thin, crystalline hemimorphite matrix. Excellent condition. Nice under magnification: hand lens, microscope or camera lens. Currently glued to a thin black styrofoam base in a hinged, plastic box. Could be removed from the foam but I would be concerned about breakage. Illustrated on page 269 of my new book, Mineral Specimen Cleaning and Development for the Amateur.