Akrochordite

arsenate

sarkinite

Formula: Mn2+5(AsO4)2(OH)4.4H2O
Hydrated arsenate containing hydroxyl
Specific gravity: 3.194 to 3.35
Hardness: 3½
Colour: Yellowish red-brown, pale to dark brown, pale pink
Solubility: Readily soluble in dilute sulphuric acid, yielding a lilac-coloured solution (Mindat).
Environments:

Metamorphic environments

Akrochordite is a rare arsenate, commonly associated with chlorophoenicite and sarkinite (Mindat). It usually crystallises latest in the sequence of other arsenates (AM74.256-262).

At the type locality, Långban, Värmland, Sweden, akrochordite occurs in hausmannite ore from a metamorphosed ion-manganese orebody, associated with pyrochroite, hausmannite, eveite, dolomite, brandtite and baryte (Mindat, Wembin, HOM, Dana).

At Sterline Hill, New Jersey, USA, akrochordite occurs in a metamorphosed stratiform zinc orebody, associated with sarkinite, chlorophoenicite and carbonates (HOM, Webmin)

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