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Formula: Mn2+5(AsO4)2(OH)4
Anhydrous arsenate containing hydroxyl,
manganese-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 4.16 measured, 4.27 calculated
Hardness: 5 to 6
Colour: Red
Environments
Arsenoclasite is a very rare arsenic-bearing mineral.
Localities
At the Iron Monarch quarry, Australia, arsenoclasite occurs in a sedimentary
iron-manganese deposit associated with
gatehouseite,
shigaite,
hematite, hausmannite,
baryte and
and manganese- and iron- bearing
calcite
(HOM).
At the type locality, Långban, Värmland, Sweden, arsenoclasite occurs in the
adelite - sarkinite
- arsenoclasite paragenesis in calcite-filled fissures cutting
hausmannite impregnated
dolomitic marble.
Both arsenoclasite and sarkinite crystallised later than
adelite.
((AM56.1539, Mindat, AM17.251) .
Associated minerals include sarkinite,
adelite, allactite,
calcite, dolomite and
hausmannite
(HOM).
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