An attractive natural specimen of cobalt-bearing calcite from the historic Shaba (Katanga) mining region of the Democratic Republic of the Congo. The specimen features a prominent open cavity lined with vivid raspberry-pink to magenta calcite crystals, displaying a bright vitreous lustre and varying degrees of translucency. Numerous intergrown crystals exhibit distinct rhombohedral forms and reflective crystal faces, creating an appealing contrast with the natural brownish-grey host rock. The matrix shows natural surface irregularities, mineral staining and small areas of greenish mineralisation. The specimen retains its original vintage collection label identifying it as "Cobalto Calcsit – Shaba, Zaire", reflecting the historical geographical designation. Condition: The specimen is presented in its natural state, with irregular matrix surfaces and intergrown crystal formations. Please examine all photographs carefully, as they form an important part of the description and show the specimen's exact appearance and condition. A colourful and visually appealing example of cobalt-bearing calcite, suitable for a mineral collection.