Hydrated phosphate containing hydroxyl, strunzite group, paramorph of laueite and stewartite
Specific gravity: 2.38 to 2.50
Colour: Pale yellow to creamy white, tan to very light brown
Ferristrunzite occurs in granite
pegmatites and in sedimentary phosphate nodules (Mindat).
It is probably an oxidation product of strunzite
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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