Roselite

arsenate

cobalt

Formula: Ca₂Co(AsO₄)₂.2H₂O
Hydrated normal arsenate
Specific gravity: 3.46 to 3.74
Hardness: 3½
Streak: White to pale pink
Colour: Rose-red, pink; rose coloured in transmitted light
Solubility: Readily soluble in acids
Environments:

Hydrothermal environments

Roselite is a rare secondary mineral in cobalt-bearing hydrothermal mineral deposits.

At the type locality, Rappold Mine, Saxony, Germany, roselite occurs in a quartz vein, associated with chalcedony.

At Bou Azzer, Morocco, roselite is associated with talmessite and erythrite.

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