Metavivianite Mineral Data

General Metavivianite Information

Chemical Formula:

(Fe++3-x,Fe+++x)(PO4)2(OH)x•8-x(H2O), x=0.5

Composition:

Molecular Weight = 501.10 gm

Iron 33.43 % Fe 35.84 % FeO / 7.97 % Fe₂O₃

Phosphorus 12.36 % P 28.33 % P₂O₅

Hydrogen 3.12 % H 27.86 % H₂O

Oxygen 51.09 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_2.5Fe³⁺_0.5(PO₄)₂(OH)_0.5•7.5(H₂O)

Environment:

Oxidized and dehydrated compared to vivianite.

IMA Status:

Approved IMA 1974

Locality:

Big Chief pegmatite, Glendale, Pennington County, South Dakota, USA. Link to MinDat.org Location Data.

Name Origin:

Named to reflect the relationship with vivianite.

Name Pronunciation:

Metavivianite + Pronunciation

Synonym:

Egueiite - a hydrous Ca-Fe phosphate, possibly altered metavivianite

ICSD 201137

Kertschenite

Oxykertschenite

PDF 26-1137

Metavivianite Image

Images:

Metavivianite

Comments: Rust-brown, metavivianite var. kertschenite crystals to 1.5 cm in length.
Location: Kertsch Crimea, Ukraine. Scale: 5.5 x 3.5 cm.
© John Veevaert

Metavivianite Crystallography

Axial Ratios:

a:b:c =0.8601:1:0.5121

Cell Dimensions:

a = 7.81, b = 9.08, c = 4.65, Z = 1; alpha = 94.77°, beta = 97.15°, gamma = 107.37° V = 311.19 Den(Calc)= 2.67

Crystal System:

Triclinic Space Group: P1 or P1

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

By Intensity(I/I_o): 6.71(1), 4.86(0.4), 8.59(0.4),

Physical Properties of Metavivianite

Cleavage:

{110} Perfect

Color:

Leek green, Gray green, Reddish brown.

Density:

2.69

Diaphaneity:

Opaque to translucent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Sub Metallic

Streak:

yellowish brown

Optical Properties of Metavivianite

Gladstone-Dale:

CI meas= 0.061 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.061 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2244,KPDmeas= 0.2244,KC= 0.2391
Ncalc = 1.64

Optical Data:

Biaxial (+), a=1.579, b=1.603, g=1.629, bire=0.0500, 2V(Calc)=90, 2V(Meas)=85.

Pleochroism (x):

blue or bluish green.

Pleochroism (y):

yellowish green or yellowish green.

Pleochroism (z):

yellowish green or yellowish green.

Calculated Properties of Metavivianite

Electron Density:

Bulk Density (Electron Density)=2.70 gm/cc
note: Specific Gravity of Metavivianite =2.69 gm/cc.

Fermion Index:

Fermion Index = 0.0073380032
Boson Index = 0.9926619968

Photoelectric:

PE_{Metavivianite}= 10.36 barns/electron
U=PE_{Metavivianite} x rElectron Density= 27.98 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Metavivianite is Not Radioactive

Metavivianite Classification

Dana Class:

40.03.09.01 (40)Hydrated Phosphates, etc

(40.03)where (A++)3 (XO4)2 ï¿½ x(H2O)

(40.03.09)Dana Group

40.03.09.01 Metavivianite (Fe3-x,Fex)(PO4)2(OH)x•8-x(H2O),x=0.5 P1 or P1 Tri

Strunz Class:

08.CE.85 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CE -With only medium-sized cations, RO4:H2O ï¿½ 1:2.5

08.CE.85 Metavivianite (Fe3-x,Fex)(PO4)2(OH)x•8-x(H2O),x=0.5 P1 or P1 Tri

08.CE.85 Metakottigite (Zn,Fe,Fe)3(AsO4)2•8((H2O),OH) P1 1

Other Metavivianite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Metavivianite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Metavivianite

(Fe++3-x,Fe+++x)(PO4)2(OH)x•8-x(H2O), x=0.5
Dana No: 40.03.09.01 Strunz No: 08.CE.85
Locality:

Notes:

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