General Information:
Chemical Formula:Fe++3(PO4)2·8(H2O)
Composition:(Molecular Weight = 501.61 gm)Iron 33.40 %
FePhosphorus 12.35 %
P Hydrogen 3.22 %
H Oxygen 51.03 %
O Empirical Formula: Fe3+3(PO4)2·8(H2O)
Environment:Common secondary mineral in the gossan of metallic ore deposits, pegmatates, sedimentary authigenic mineralization in association with organic materials.
IMA Status:IMA Approved
Name Origin:Named after the English mineralogist, J. G. Vivian.
Physical Properties: Cleavage:[010] Perfect
Color:colorless, green, blue, dark green, or dark bluish green.
Density:2.6 - 2.7, Average = 2.65
Diaphaniety:Transparent to translucent to opaque
Habits:Divergent - Crystals radiate from a center without producing stellar forms., Concretionary - Rounded massive fine-grained materials., Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Hardness:1.5-2 - Talc-Gypsum
Luminescence:None.
Luster:Vitreous - Pearly
Streak:bluish white
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