This specimen consists of a cavity lined with siderite crystals, over which a fine drusy coating of cerussite has developed, forming a visually refined and mineralogically instructive assemblage. The cerussite occurs as dense microcrystalline aggregates, imparting a pale, sparkling surface that contrasts subtly with the underlying siderite. The siderite crystals provide a darker brown to grey framework, with well-defined crystal faces that remain legible beneath the drusy overgrowth, giving the specimen depth and textural complexity rather than a uniform surface.

The specimen was collected from Taouz, a locality known for oxidised-zone lead mineralisation associated with carbonate-hosted deposits. In this setting, siderite formed as an earlier iron carbonate phase within open cavities and fractures. Subsequent supergene alteration of primary lead minerals introduced carbonate-rich fluids, leading to the precipitation of cerussite as a late-stage mineral coating the existing siderite crystals. The relationship between the two minerals preserves a clear paragenetic sequence typical of North African oxidised lead deposits.

Measuring 75 × 55 × 30 mm and weighing 191 grams, the specimen is substantial and well balanced, with the cavity geometry clearly expressed. The drusy cerussite coverage is even and continuous, enhancing the overall sparkle while still allowing the underlying siderite crystal forms to be read. The proportions give the specimen a strong cabinet presence, with sufficient depth to convey its three-dimensional cavity structure.

Collected during the 1970s and forming part of the J & S Mommers Collection, this specimen carries strong historical provenance from a respected Australian private collection. Cerussite specimens from Taouz showing well-preserved drusy development on siderite-lined cavities are increasingly uncommon. This piece represents a well-documented example of Moroccan supergene lead mineralisation and serves as a strong reference specimen for a locality-focused or paragenetically oriented mineral collection.