Hydrated normal arsenate, vivianite group (Dana), may be intergrown with its paramorph, parasymplesite (Mindat).
Specific gravity: 2.96 to 3.01
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).
Symplesite is a rare secondary arsenate in the oxidised zone of some
arsenic-rich hydrothermal mineral deposits, associated with pharmacosiderite,
parasymplesite and limonite
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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