Fe3[PO4]2*8H2O 

 

Vivianite crystals build up only if phosphorous acidic solvents are in contact with Fe-compunds like Pyrrhotine, Pyrite, Siderite, Fayalite - in an oxygen-free environment.

First location had been Nickenicher Sattel, later also in Dellen area in contact with Fe-rich environment with Jarosite. (quoted G.Blaß)

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The micromounts are very fragile and have to be handled very carefully. The following pictures are linked to findings from Bernd Ternes, thanks to him.

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