Iron Phosphate
Fe3(PO4)2 * 8H2O
Chemical name
Iron Phosphate
Mineral name
Vivianite
Chemical formula
Fe3(PO4)2 * 8H2O
Crystal system
monoclinic
Crystal Class
(2/m)
Unit cell
a [Å]:10.086
b [Å]:13.441
c [Å]:4.703
Formula units
Z=2
Mohs hardness
1.5 - 2
Density [g/cm3]
2.68
Cleavage
perfect on {010}
Color
pale green
Transparency
transparent to translucent
Optical character
biaxial (+)
Refractive Index
nα=1.579-1.616; nβ=1.602-1.656; nΥ=1.629-1.675
Birefringence δ
0.050 - 0.059
Pleochroism δ
visible; X=blue, deep blue, indigo-blue; Y=pale yellowish green, pale bluish green, yellow-green; Z=pale yellowish green, olive-yellow