Well defined crystal of Gypsum from the Tsumeb Mine, Namibia are rare, what makes this specimen even more desirable is the moving bubble trapped in an internal cavity. The well terminated Gypsum crystal measures to 9cm, is gemmy with lustrous faces. A matrix dominated by metallic grey Galena, with some micro-crystals of Calcite. The bubble can clearly be seen moving in its cavity down from the termination and just off centre, measuring to 0.5cm. A great curiosity from the Tsumeb Mine.