Vivianite (Fe3(PO4)2•8H2O) is an iron phosphate mineral. It occurs as a secondary mineral found in a number of geological environments. It is usually found as deep blue to deep bluish green prismatic to flattened crystals.  It is formed by the alteration of ore deposits near the surface, or of primary phosphates in pegmatites. Vivianite crystals are often found inside fossil shells, such as those of bivalves and gastropods, or attached to fossil bone. Vivianite darkens upon exposure to…

Vivianite (Fe3(PO4)2•8H2O) is an iron phosphate mineral. It occurs as a secondary mineral found in a number of geological environments. It is usually found as deep blue to deep bluish green prismatic to flattened crystals. It is formed by the alteration of ore deposits near the surface, or of primary phosphates in pegmatites. Vivianite crystals are often found inside fossil shells, such as those of bivalves and gastropods, or attached to fossil bone. Vivianite darkens upon exposure to…

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