Ferristrunzite

ferristrunzite

crandallite

diadochite

strengite

Images

Formula: Fe3+Fe3+2(PO4)2(OH)3.5H2O
Hydrated phosphate containing hydroxyl, strunzite group, paramorph of laueite and stewartite
Specific gravity: 2.38 to 2.50
Hardness: 4
Streak: White
Colour: Pale yellow to creamy white, tan to very light brown
Environments

Pegmatites
Sedimentary environments
Hydrothermal environments

Ferristrunzite occurs in granite pegmatites and in sedimentary phosphate nodules (Mindat). It is probably an oxidation product of strunzite (HOM).

Localities

At the type locality, Mont-des-Groseillers, Blaton, Bernissart, Hainaut, Wallonia, Belgium, ferristrunzite occurs as light brownish-yellow matted aggregates of acicular crystals, 2 to 30 microns long; composites are up to 0.5 mm long and radiating sprays are up to 2.6 mm in diameter.
The ferristrunzite is associated with crandallite, diadochite, allophane-evansite, minyulite, strengite, phosphosiderite, cacoxenite and beraunite, as a secondary mineral in argillaceous and clastic sediments exposed in a canal (AM 74.502).

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