- Vivianite
Vivianite Fe3(PO4)2·8(H2O), hydrated
iron phosphate , is a secondarymineral 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.It is formed by the alteration of ore deposits near the surface, or of primary phosphates in
pegmatite s. Vivianite crystals are often found insidefossil shells, such as those ofbivalve s andgastropod s, or attached to fossil bone.Vivianite darkens upon exposure to light, and was named in
1817 afterJ.G.Vivian , an English mineralogist who first discovered crystals of the mineral inCornwall .Notable localities are
Russia ,Ukraine ,Namibia ,England , andMaryland ,Colorado in theUnited States , and the town ofIwama ,Japan .The type locality is Wheal Kind, in
St Agnes, Cornwall . [ [http://www.mindat.org/min-4194.html Vivianite: Vivianite mineral information and data ] ]ee also
*
List of minerals
*List of minerals named after people References
* [http://webmineral.com/data/Vivianite.shtml Webmineral data]
* [http://sciencelinks.jp/j-east/article/199911/000019991199A0349754.php]
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