Formula: Fe2+3(AsO4)2.8H2O
Hydrated normal arsenate, vivianite group
(Dana), may be intergrown with
its paramorph, parasymplesite (Mindat).
Crystal System: Triclinic
Specific gravity: 2.96 to 3.01 measured, 3.02 calculated
Hardness: 2½
Streak: White, bluish white
Colour: Light green, greenish black, light blue, indigo blue
Solubility: Soluble in acids. Turns reddish brown in strong KOH solution or in 30% H2O2
(Mindat).
Environments
Symplesite is a rare secondary arsenate in the oxidised zone of some
arsenic-rich hydrothermal mineral deposits, associated with pharmacosiderite,
scorodite, erythrite,
roselite, annabergite,
parasymplesite and limonite
(HOM, Mindat).
At the type locality, Tännig, Bad Lobenstein, Thuringia, Germany, symplesite occurs in the oxidised zone of arsenic-bearing
hydrothermal deposits, associated with scorodite,
roselite, pharmacosiderite,
parasymplesite, erythrite and
annabergite (Mindat).
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