Formula: Ca2Mg(AsO4)2.2H2O
Hydrated normal arsenate, roselite group
Forms a series with roselite
Specific gravity: 3.52
Hardness: 3 to 4
Streak: Pale pink
Colour: Pale pink to red

Hydrothermal environments

Wendwilsonite is a rare secondary mineral in cobalt-bearing hydrothermal mineral deposits. There are two type localities, Sterline Hill mine and Arhbar mine.

At the Arhbar mine, Bou Azzer, Mexico, wendwilsonite is associated with talmessite and erythrite on altered ore and calcite gangue (Dana, HOM).

At the Sterling Hill mine, New Jersey, USA, wendwilsonite occurs with calcite crystals on serpentine in franklinite - willemite ore (Dana).

Common impurities: Co

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