Eveite , Akrochordite Locality: Långban, Filipstad, Värmland, Sweden Dimensions: 1.5 cm x 1.0 cm x 1.0 cm Extremely rare, co-type material from the type locality at Langban. Bright green, vitreous, <0.5mm cluster of eveite hosted within a small vug. Accompanied by other eveite fragments and brown, subhedral akrochordite in a contrasting, pink, granular carbonate matrix. Includes old detailed A. F. Eadie and Topaz-Mineral Exploration labels. Ex. Rock Currier collection. Tom and Melissa Campbell photos. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Eveite
A manganese arsenate of the olivenite group known only from Långban, Sweden and New Jersey's Sterling mine.
Intro adapted from Wikipedia (CC BY-SA).
Eveite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Mn²⁺₂(AsO₄)(OH).
It crystallizes in the orthorhombic crystal system (space group Pnnm). It is a member of the Andalusite structural group.
Key properties: Mohs hardness 4; specific gravity 3.67; White streak; optically biaxial.
IMA symbol Ev, IMA status: approved, named in 1966.
Very rare, in fissures in a metamorphosed Fe–Mn orebody (Långban, Sweden); in a metamorphosed stratiform zinc orebody (Sterling Hill, New Jersey, USA).
It is found associated with Akrochordite, manganoan hörnesite, hausmannite, carbonates, Fe–Mn oxides (Långban, Sweden); willemite, sarkinite (Sterling Hill, New Jersey, USA).
The name refers to the biblical Eve, in contrast to adamite, with which it is isostructural.