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Vivianite [abbr. Viv ]

Year of discovery: 1817 (Wheal Kind, UK), 1877 (Japan)

Locality list: 112 localities of vivianite

• Fe₃(PO₄)₂,8H₂O
• [Fe²⁺₃][(PO₄)₂]^6-,8H₂O

• Class: Vivianite group
• Class: Phosphate - Hydrate
• Soluble in: HCl, HNO₃, H₂SO₄
• Oxidezed to dark color Metavivianite by H₂O₂ as Fe²⁺ changed to Fe³⁺.
• Oxidezed to dark color Metavivianite by light exposure as Fe²⁺ changed to Fe³⁺.
• Formed by alteration of Beraunite or Triphylite.
• Formed by wethering alteration of Sarcopside.
• Substitution pseudomorph: Replaced by Santabarbaraite.

• Fe => Mg: Baricite
• Fe => Ni: Arupite
• Fe => Co: Pakhomovskyite

• PO₄ => AsO₄: Symplesite, Parasymplesite

• xH₂O => (OH)x: Metavivianite

• Color: Colorless
• Tarnish: Blue, Green (by photo-oxidation)
• Streak: Colorless, Pale blue
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Platy

• Cleavage: Perfect on {010} (1 plane), Imperfect on {-106} and {100} (2 planes)
• Hardness: 1.5-2
• Density: 2.7

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=10.1, b=13.4, c=4.7, β=104.3

Etymology: John Henry Vivian (1785-1885), British mineralogist