Ashoverite, a New Mineral, and Other Polymorphs of Zn(OH)₂ from Milltown, Ashover, Derbyshire

Abstract

Four polymorphs of Zn(OH)2 have now been recorded from an oxidised vein exposure near Milltown, Ashover, Derbyshire; sweetite, wfilfingite, ~,-Zn(OH)2, and ashoverite. The last is a new mineral, a tetragonal modification of Zn(OH)2 containing minor quantities of Pb, Cd and Ca. Its unit cell dimensions are a 6.825 (2)

Evidence for an Unusual Temperature Dependence of the Atmospheric Corrosion of Zinc

“…Several zinc hydroxide allotropes are known, including three minerals; sweetite, ashoverite and wulfingite. [43][44][45] It is important to note that zincite is reported to be more stable than the zinc hydroxides from the point of view of equilibrium thermodynamics. 34 Therefore, direct conversion of zincite into zinc hydroxide is thermodynamically disallowed.…”