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Stalactitic Tubular Malachite from Congo on Stand — A specimen of stalactitic malachite from Congo, mounted on a black wooden base with brass support. A very interesting specimen for its shape and structure, different from the classic compact or polished malachites: here the mineral presents itself as a natural tubular growth, branched and concretionary. The shape of the specimen is very scenographic. The upper parts show several open apices, with circular and concentric sections, resembling small mineral tubes. These openings should not be interpreted as gas emissions, but as the result of stalactitic growth of malachite: ancient channels of deposition along which copper- and carbonate-rich solutions flowed or dripped. Malachite is a basic copper carbonate that forms as a secondary mineral in the oxidation zones of copper ore deposits. In copper-rich environments, mineralized water traverses fractures, cavities and voids of the rock; over time, the mineral precipitates slowly, layer by layer, building concentric walls and tubular shapes. The lines visible on the apices and on the side sections tell precisely these successive growth stages. The specimen presents undulated surfaces, natural crests, cavities and internal bands, with green hues typical of Congo malachite. The overall appearance is almost sculptural: a small geological architecture, born from water circulation and copper chemistry. Mounting on a black wooden base with brass frame enhances the verticality of the specimen and makes it suitable both for a mineralogical collection and for a contemporary Wunderkammer or a decorative setting dedicated to natural history. A collectible specimen for those seeking a distinctive malachite, not only for color but above all for its natural form and for the readability of its formation process. Technical data Mineral: Malachite Chemical formula: Cu2CO3(OH)2 Type: Stalactitic, tubular and concretionary malachite Origin: Congo Support: Base in black wood with brass structure Category: Collectible mineral, decorative mineral sample

Schätzpreis:€1,900

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