Goslarite is a hydrated zinc sulfate mineral (ZnSO4 · 7 H2O) which was first found in the Rammelsberg mine, Goslar, Harz, Germany.

Goslarite is soluble in water, has an astringent taste, and is strongly diamagnetic.

[6][7][8] Goslarite is formed from the oxidation of sphalerite ((Zn, Fe)S).

[9] It was first found in Rammelsberg mine, Goslar, Harz, Germany.

It often occurs as an efflorescence on timbers and walls of mine passages.