Hydrated phosphate containing hydroxyl, turquoise group and forms a series with turquoise
Specific gravity: 3.22
Hardness: 4½
Streak: pale green to greenish to white
Colour: dark green to apple-green
Solubility: Soluble with difficulty in HCl.

Hydrothermal environments

Chalcosiderite is an uncommon mineral occurring in the oxidised zone of some hydrothermal deposits (Mindat, Webmin, HOM). Associated minerals include crandallite, cyrilovite, dufrénite, leucophosphite, libethenite, pseudomalachite, saléeite, sampleite, and torbernite (Mindat).

At Lake Boga quarry, Australia, chalcosiderite is associated with sampleite, libethenite, crandallite, cyrilovite, pseudomalachite, saléeite, torbernite and ulrichite (HOM).

There are two co-type Localities, the Hollertszug Mine, Dermbach, Herdorf, Altenkirchen, Rhineland-Palatinate, Germany and the Phoenix United Mine, Minions, Linkinhorne, Cornwall, England, UK.

At the West Phoenix mine, Cornwall, England, chalcosiderite is associated with goethite and dufrénite (HOM).

At the Gunheath china clay pit, Cornwall, England, chalcosiderite is associated with dufrénite, cyrilovite and leucophosphite (HOM).

Common impurities: Al

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