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Mineralpedia Details for Chalcosiderite

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Chalcosiderite

Chalcosiderite

Named from the Greek words for “copper” and “iron,” chalkos and sidero, respectively, in reference to the mineral’s chemical composition. Chalcosiderite is a relatively rare mineral that can be founf in oxidized hydrothermal mineral deposits in localities in England, Germany, Portugal, France, the United States, and Australia, among several others. Minerals associated with Chalcosiderite include dufrenite, goethite, cyrilovite, leucophosphite, sampleite, libethenite, crandallite, pseudomalachite, saleeite, torbernite, and ulrichite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/chalcosiderite.pdf

Formula
Cu2+Fe3+6(PO4)4(OH)8·4H2
Crystal System
Triclinic 
Crystal Habit
Encrustations 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
apple green, dark green 
Streak
white 
Class
Triclinic - Pinacoidal 
Hardness
4.5 
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Chalcosiderite from Wheal Phoenix, Linkinhorne, Liskeard dist., Cornwall, England

Chalcosiderite
            from Wheal Phoenix, Linkinhorne, Liskeard dist., Cornwall, England

Deep green flat, pseudohexagonal micro crystals to 0.75mm.

Dark green, sugary looking complete rosettes and tiny hexagonal plates of Chalcosiderite to 0.5mm.

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Chalcosiderite from Golconda Summit, Humboldt Co., Nevada, United States

Chalcosiderite
            from Golconda Summit, Humboldt Co., Nevada, United States

Light green curved microcrystals of Chalcosiderite to < 0.25mm and as a fine microcrystalline crust on matrix.

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Chalcosiderite from Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany

Chalcosiderite
            from Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany

Dark green drusy or crystal aggregates in a 7x7mm vug with Torbernite and also associated with dark brown Leucophosphite, yellowish Cyrilovite and lilac Strengite.

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CHALCOSIDERITE from Wheal Phoenix, Linkinhorne, Liskeard dist., Cornwall, England

CHALCOSIDERITE
            from Wheal Phoenix, Linkinhorne, Liskeard dist., Cornwall, England
Special Info
Phillips Collection

Light to darker green crystal clusters to 4mm composed of pseudohexagonal crystals to nearly 0.5mm. The green crystals contrast well against the black Goethite matrix. G

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Chalcosiderite from Redruth, Cornwall, England

Chalcosiderite
            from Redruth, Cornwall, England

Larger specimen loaded with trunslucent, emerald to dark green, thin, platy crystals of Chalcosiderite with hexagonal outline to about 0.75mm. These crystals are gorgeous under the scope. The Redruth tin-copper district was one of the most intensely mined districts in Cornwall. Good Chalcosiderite specimens such as these are very hard to come by on today's market. The label shown in the provenance tab is that of Paul Moore's collection who obtained it from D. Pruden. Has a sawed flat backside with a number matching the label.

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