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VIVIANITE

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Originally appearing in Volume V28, Page 153 of the 1911 Encyclopedia Britannica.
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VIVIANITE , a See also:

mineral consisting of hydrated See also:iron phosphate Fe3(PO4)2+8H20, crystallizing in the See also:monoclinic See also:system. The crystals possess a perfect cleavage parallel to the See also:plane of symmetry and are usually bladed- in See also:habit; they are soft (H = z ~, flexible and sectile The specific gravity is 2.6. When unaltered and containing no ferric See also:oxide, the mineral is colourless, but on exposure to 'the See also:light it very soon becomes of a characteristic See also:indigo-See also:blue See also:colour. Crystals were first found in See also:Cornwall (at Wheal Jane, near See also:Truro, associated with See also:pyrrhotite) by J. G. See also:Vivian, after whom the See also:species was named by A. G. See also:Werner in 1817. The mineral had, however, been earlier known as a blue powdery substance, called " blue iron-See also:earth," met with in See also:peat-bogs, in See also:bog iron-ore, or with fossil bones and shells. (L. J.

End of Article: VIVIANITE

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