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Formula: Fe3+3(AsO4)2(OH)3.5H2O
Hydrated arsenate,
symplesite group
Crystal system: Monoclinic
Specific gravity: 2.885 measured from a probable mixture
Hardness: 2½
Colour: Dark amber-brown, yellow-brown, yellow
Environments
Localities
At the type locality, the Hudson Bay Mine, Coleman Township, Cobalt area, Cobalt-Gowganda region, Timiskaming District,
Ontario, Canada, ferrisymplesite occurs in the oxidised zone of a Co–Ni sulphide deposit, associated with
erythrite–annabergite
(HOM).
At Neubulach, Calw, Karlsruhe Region, Baden-Württemberg, Germany, ferrisymplesite occurs in the oxidised zone of a
polymetallic hydrothermal ore deposit, associated with copper and malachite
(HOM).
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