Images
Formula: Mn2+3(AsO4)2.8H2O
Hydrated arsenate,
vivianite group,
manganese-bearing mineral
Crystal System: Monoclinic
Specific gravity: 2.64 measured, 2.76 calculated
Hardness: 1
Streak: White
Colour: White to colourless
Luminescence: Not fluorescent under UV
Environments
Localities
At the type locality, the Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden,
manganhörnesite occurs in fissure veins in skarn in a
metamorphosed iron-manganese
orebody. Associated minerals include rhodochrosite,
synadelphite, quartz
and nadorite
(HOM, Mindat)
At the Sterling Mine, Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA, manganhörnesite is
associated with adelite,
alleghanyite,
kraisslite and willemite
(HOM).
Back to Minerals