eveite

{{Infobox mineral | name = Eveite | category = Arsenate minerals | boxwidth = | image = Eveite, Akrochordite-661878.jpg | imagesize = | caption = Eveite found in Sweden | formula = Mn22+AsO4OH | IMAsymbol = Ev | strunz = 8.BB.30 | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Pnnm | unit cell = a = 8.57(1), b = 8.77(1) c = 6.27(1) [Å]; Z = 4 | molweight = 265.80 g/mol | color = Apple green, pale yellow | habit = Tabular or sheaf-like | twinning = | cleavage = Fair on {101} | fracture = | tenacity = | mohs = - 4 | luster = Vitreous | refractive = nα = 1.700(5), nβ = 1.715(5), nγ = 1.732(10) | opticalprop = Biaxial | birefringence = β = .032 | pleochroism = Visible: X = Z = green Y = Yellow | 2V = Measured: 65° | streak = White | gravity = 3.76 | density = | melt = | fusibility = | diagnostic = | solubility = completely soluble in cold 1:1 HCl | diaphaneity = Semitransparent | other = | references = }}

Eveite is a manganese arsenate mineral in the olivenite group. Its chemical formula is Mn2AsO4OH. It is found only in Långban, Filipstad, Värmland, Sweden and at the Sterling Mine in New Jersey, United States. It is a dimorph of sarkinite and is isostructural with adamite. The name, for the biblical "Eve", comes from its structural similarities to adamite and is also a reference to its apple-green color. It can also be pale yellow. Eveite is an orthorhombic mineral, which means it has three crystallographic axes of unequal lengths which are at 90° to one another.