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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
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
sedimentary
marl, associated with
rockbridgeite,
phosphosiderite and beraunite
(Dana, HOM, Mindat, AM 69.811).
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