Ferrostrunzite

minerals

diadochite

leucophosphite

beraunite

Formula:Fe2+Fe3+2(PO4)2(OH)2.6H2O
Hydrated phosphate containing hydroxyl, strunzite group, paramorph of metavivianite
Specific gravity: 2.50
Hardness: 4
Streak: White
Colour: Creamy yellow, pale yellow, tan to light brown
Environments

Sedimentary environments

Ferrostrunzite is a secondary phosphate in sedimentary rocks replacing rockbridgeite (Webmin). Common associates include siderite and vivianite (Mindat).

Localities

At Arnsberg, Germany, ferrostrunzite is associated with beraunite and cacoxenite (HOM).

At Bethel Church, Indiana, USA, ferrostrunzite occurs as a secondary phosphate in weathered phosphatic black shale beds associated with vivianite, aluminian strengite, diadochite, leucophosphite, beraunite and fluorapatite (HOM).

At the type locality, Raccoon Creek, Mullica Hill, Harrison Township, Gloucester county, New Jersey, USA, sprays of ferrostrunzite encrust rockbridgeite that has replaced fossil marine shells in Cretaceous sedimentary marl, associated with rockbridgeite, phosphosiderite and beraunite (Dana, HOM, Mindat, AM 69.811).

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