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The Mineral Vivianite

Vivianite is a mineral of hydrated iron phosphate found in diverse geological settings.  Iron (Fe2) may find substation in Small quantities with manganese Mn2+, calcium Ca and magnesium Mg. Vivianite,   in its pure form is colorless and oxidizes very quickly.  In the process, it changes color to deep bluish green to deep blue and may also appear like flattened prismatic crystals.  You can often find them in fossil shells that sometimes display Vivianite crystals  inside them, especially the bivalves and gastropods.       

Chemical Formula  
Fe2+Fe2+2 (PO4) 2·8H2O

Derivation of Name  
It was discovered by John Vivian, a Welsh-Cornish mineralogist, politician and mine owner,  who lived in Truro, Cornwall, England. It was named after John Vivian by Abraham Gottlob Werner in 1817, the year he died.

Occurrence         
Vivianite can be found in many environments, particularly organic-rich sedimentary deposits like sandstones and clays. It is also found in phosphate-rich granite pegmatites plus hydrothermal replacement deposits.

Gemology  
Vivianite as a gemstone, is helpful for people who do not feel comfortable about their being, meaning people who consider themselves to be misfits on our planet. Vivianite is particularly helpful for children, helping them as they grow. Generally speaking, it helps one to recognize being on earth.

Source 
It is prominently found in Colorado and Maryland, USA; England, Russia, and Ukraine.

Mineralogy  
Vivianite comes in vibrant colors with a pleasant sparkle. Many clusters of the mineral occur within snail shells, fossil clams or affixed with fossil animal bones. It is not the kind of mineral to be displayed, because, on prolonged exposure to sunlight, its specimens become dark, almost black. So, these should be stored in dark containers, away from light.  Darkening takes place due to oxidation of the iron from +2 to +3. On being exposed to light, the process of oxidation gets accelerated. You may use it in deriving pleasure, but then put it back in a dark cupboard to protect its splendor for many years.

Color           
Color may be green, blue or colorless, that gets darkened on being exposed to light.

Density                              
2.696 g/cm3

Mohs Hardness                              
1.5 – 2

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