goslarite

{{Infobox mineral | name = Goslarite | image = File:Goslarita. Gostar.Hartz,Sajonia.JPG | imagesize = 260px | caption = Goslarite on display at the Museo Nacional de Ciencias Naturales | category = Sulfate mineral | formula = | IMAsymbol = Gos | molweight = 287.56 g/mol | strunz = 7.CB.40 | system = Orthorhombic | class = Disphenoidal (222) (same H-M symbol) | symmetry = P212121 | unit cell = a = 11.8176 Å, b = 12.0755 Å c = 6.827 Å, Z = 4 | color = Colorless, pinkish, white, greenish, green, blue, green blue, bluish and brownish | habit = Acicular, massive, stalactitic | cleavage = {010} perfect | fracture = Conchoidal | tenacity = Brittle | mohs = 2.0–2.5 | luster = Vitreous (glassy) | opticalprop = Biaxial (-) | refractive = nα = 1.447 - 1.463 nβ = 1.475 - 1.480 nγ = 1.470 - 1.485 | birefringence = δ = 0.0220–0.0230 | pleochroism = none | 2V = 46° | streak = White | gravity = 1.96 | references = }}

Goslarite is a hydrated zinc sulfate mineral () 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 () and morenosite (). Goslarite is an unstable mineral at the surface and will dehydrate to other minerals like bianchite (), boyleite () and gunningite ().