Vivianite

  Vivianite Fe₃(PO₄)₂·8(H₂O), hydrated iron phosphate, is a secondary mineral found in a number of geological environments. Usually found as deep blue to deep bluish green prismatic to flattened crystals, most crystals rather small to microscopic, larger ones are rare.

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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 light, and was named in 1817 after J.G. Vivian, an English mineralogist who first discovered crystals of the mineral in Cornwall.

Notable localities are Russia, Ukraine, Namibia, England, and Maryland and Colorado in the United States.

The type locality is Wheal Kind, in St Agnes, Cornwall.^[1]

See also

• List of minerals
• List of minerals named after people

References

• Webmineral data