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Encyclopedia Britannica



VIVIANITE

This article appears in Volume V28, Page 153 of the Encyclopedia Britannica.

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


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