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RM3648   Vivianite and goethite
Fe²⁺Fe²⁺₂(PO₄)₂·8H₂O
  -  8. Phosphates, arsenates and vanadates

On a goethite matrix, with stalactitic and botryoidal forms, various aggregates of tabular to prismatic vivianite crystals. Very aerial, with a very intense green, almost black, color, with green luster and reflections. A very good specimen for the species.

Size: 6.2 x 4.7 x 3.9 cm.
Main crystal: 18 mm.
Col. F. Coune (Belgique).
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