Goslarite

Goslarite is a hydrated zinc sulfate mineral (ZnSO₄·7(H₂O)) which was first found in the Rammelsberg mine, Goslar, Harz, Germany. It was described in 1847. Goslarite belongs to the epsomite group which also includes epsomite (MgSO₄·7H₂O) and morenosite (NiSO₄·7H₂O). Goslarite is an unstable mineral at the surface and will dehydrate to other minerals like bianchite (ZnSO₄·6H₂O), boyleite (ZnSO₄·4H₂O) and gunningite (ZnSO₄·H₂O).