Eveite

arsenate

olivenite

Formula: Mn2+2(AsO4)(OH)
Anhydrous arsenate containing hydroxyl
Dimorph of sarkinite, olivenite group
Specific gravity: 3.76
Hardness: 4
Streak: White
Colour: Apple green, pale yellow
Solubility: Readily soluble in cold hydrochloric acid
Environments:

Metamorphic environments

Eveite is a very rare secondary mineral found encrusting cavities and fractures in deposits containing iron-manganese oxides and carbonates, associated with hausmannite, dolomite and calcite.

At the type locality, Långban, Värmland, Sweden, eveite occurs in fissures in a metamorphosed iron–manganese orebody, associated with akrochordite, manganoan hornesite and hausmannite.

At Sterling Hill, New Jersey, USA, eveite occurs in a metamorphosed stratiform zinc orebody, associated with willemite and sarkinite.

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