Pyromorphite with Malachite

Pyromorphite with Malachite from Brown's Prospect, Rum Jungle, Northern Territory, Australia, measuring 66 × 45 × 15 mm and weighing 57 grams. The specimen shows yellow and green mineral development across an uneven surface. The contrasting colours make the recorded lead-phosphate and copper-carbonate association an inviting subject for closer examination.

Pyromorphite is a lead phosphate containing chloride, while Malachite is a copper carbonate hydroxide. Both are associated with secondary mineral development, but their chemistry is quite distinct. Together they give a collector an opportunity to explore how different metals and chemical groups can be represented within a single mineral assemblage from an altered deposit.

Brown's Prospect is the specific locality within the Rum Jungle area. The relatively shallow 15 mm depth gives this piece a different overall profile from larger, more three-dimensional specimens from the same prospect. Its 66 mm span provides useful room for examining the yellow and green areas shown in the close views, while retaining a compact display size. The specimen comes from the David Vince Collection. Its appeal lies in the combination of a precise Northern Territory occurrence, contrasting mineral development and two chemically different species. It offers a clear subject for an Australian secondary-mineral group, with the collection provenance preserving the later history of the piece alongside its geological source.