Vivianite Mineral Data

Vivianite Mineral Data +

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General Vivianite Information

Chemical Formula:

Fe++3(PO4)2·8(H2O)

Composition:

Molecular Weight = 501.61 gm

Iron 33.40 % Fe 47.75 % Fe₂O₃

Phosphorus 12.35 % P 28.30 % P₂O₅

Hydrogen 3.22 % H 28.73 % H₂O

Oxygen 51.03 % O

______ ______

100.00 % 104.78 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺₃(PO₄)₂·8(H₂O)

Environment:

Common secondary mineral in the gossan of metallic ore deposits, pegmatites, sedimentary authigenic mineralization in association with organic materials.

IMA Status:

Valid Species (Pre-IMA) 1817

Locality:

St. Agnes, Cornwall, England Link to MinDat.org Location Data.

Name Origin:

Named after the English mineralogist, J. G. Vivian.

Synonym:

Blue Iron Earth

ICSD 200703

PDF 30-662

Vivianite Image

Images:

Vivianite

Comments: Transparent, bluish crystal aggregate of vivianite on matrix.
Location: Santa Eulalia, Chihuahua, Mexico. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Vivianite Maricite

Comments: Brown maricite nodule with internal radiating structure, with blue vivianite.
Location: Big Fish River, Yukon Territory, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Vivianite Eosphorite

Comments: Bottle-green translucent vivianite crystal (2cm) associated with reddish, micro eosphorite crystals.
Location: Lavra do ?nio pegmatite, Galil?ia, Governador Valadares, Rio Doce, Minas Gerais, Brazil. Scale: 3.5 x 3 x 2 cm..
© Tom Loomis / Dakota Matrix

Vivianite Crystallography

Axial Ratios:

a:b:c =0.7501:1:0.3501

Cell Dimensions:

a = 10.06, b = 13.41, c = 4.696, Z = 2; beta = 104.3° V = 613.88 Den(Calc)= 2.71

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 6.8(1), 2.71(0.67), 2.97(0.67),

Forms:

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Forms: [ 0 1 0] [ 2 0 1] [ 2 2 1] [ 1 0 0] [ 1 1 0]

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Crystal Structure:

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Takagi S , Mathew M , Brown W E , American Mineralogist , 71 (1986) p.1229-1233, Crystal structures of bobierrite and synthetic Mg3(PO4)2.8H2O

Physical Properties of Vivianite

Cleavage:

[010] Perfect

Color:

Colorless, Green, Blue, Dark green, Dark bluish green.

Density:

2.6 - 2.7, Average = 2.65

Diaphaniety:

Transparent to translucent to opaque

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Concretionary - Rounded massive fine-grained materials.

Habit:

Divergent - Crystals radiate from a center without producing stellar forms.

Habit:

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

Optical Properties of Vivianite

Gladstone-Dale:

CI meas= 0.205 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.222 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2332,KPDmeas= 0.2385,KC= 0.2999

Optical Data:

Biaxial (+), a=1.58-1.626, b=1.598-1.662, g=1.627-1.699, bire=0.0470-0.0730, 2V(Calc)=78-88, 2V(Meas)=63.5-83.5. Dispersion none.

Pleochroism (x):

cobalt blue.

Pleochroism (y):

pale greenish yellow.

Pleochroism (z):

pale greenish yellow.

Calculated Properties of Vivianite

Electron Density:

r_electron=2.66 gm/cc
note: r_Vivianite=2.65 gm/cc.

Fermion Index

Fermion Index = 0.00733
Boson Index = 0.99267

Photoelectric:

PE_Vivianite= 10.34 barns/electron
U=PE_Vivianite x r_electron= 27.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Vivianite is Not Radioactive

Vivianite Classification

Dana Class:

40.3.6.1 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.6)Dana Group

40.3.6.1 Vivianite Fe3(PO4)2·8(H2O) C 2/m 2/m

40.3.6.2 Baricite (Mg,Fe)3(PO4)2·8(H2O) C 2/m 2/m

40.3.6.3 Erythrite Co3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.4 Annabergite Ni3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.5 Kottigite Zn3(AsO4)2·8(H2O) C 2/m 2/m

40.3.6.6 Parasymplesite Fe3(AsO4)2·8(H2O) C 2/m 2/m

40.3.6.7 Hornesite Mg3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.8 Arupite (Ni,Fe)3(PO4)2·8(H2O) I2/m 2/m

40.3.6.9 IMA2004-021! Co3(PO4)2·8(H2O) C 2/m 2/m

Strunz Class:

VII/C.13-40 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.13 - Vivianite group

VII/C.13-10 Bobierrite Mg3(PO4)2·8(H2O) C 2/c 2/m

VII/C.13-20* Cattiite! Mg3(PO4)2·22(H2O) P1 1

VII/C.13-20 Manganese-hornesite (Mn,Mg)3(AsO4)2·8(H2O) P 2₁/c 2/m

VII/C.13-30 Baricite (Mg,Fe)3(PO4)2·8(H2O) C 2/m 2/m

VII/C.13-40 Vivianite Fe3(PO4)2·8(H2O) C 2/m 2/m

VII/C.13-45 Arupite (Ni,Fe)3(PO4)2·8(H2O) I2/m 2/m

VII/C.13-50 Hornesite Mg3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-60 Parasymplesite Fe3(AsO4)2·8(H2O) C 2/m 2/m

VII/C.13-70 Erythrite Co3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-80 Annabergite Ni3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-90 Kottigite Zn3(AsO4)2·8(H2O) C 2/m 2/m

Other Vivianite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Dana8) OPTIC PROP.(Mason68)

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Vivianite

Fe++3(PO4)2·8(H2O)
Dana No: 40.3.6.1 Strunz No: VII/C.13-40
Locality:

Notes: