Metavivianite Mineral Data

Metavivianite Mineral Data
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General Metavivianite Information

Help on Chemical Formula: Chemical Formula: (Fe++3-x,Fe+++x)(PO4)2(OH)x•8-x(H2O), x=0.5
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe2+2.5Fe3+0.5(PO4)2(OH)0.5•7.5(H2O)
Help on Environment: Environment: Oxidized and dehydrated compared to vivianite.
Help on IMA Status: IMA Status: Approved IMA 1974
Help on Locality: Locality: Big Chief pegmatite, Glendale, Pennington County, South Dakota, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named to reflect the relationship with vivianite.
Help on Name Pronunciation: Name Pronunciation: Metavivianite + Pronunciation Say METAVIVIANITE
Help on Synonym: Synonym: Egueiite - a hydrous Ca-Fe phosphate, possibly altered metavivianite
  ICSD 201137
  Kertschenite
  Oxykertschenite
  PDF 26-1137
 

Metavivianite Image

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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
Help on Axial Ratios: Axial Ratios: a:b:c =0.8601:1:0.5121
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: TriclinicSpace Group: P1 or P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.71(1), 4.86(0.4), 8.59(0.4),
Click Here for Large Metavivianite Structure Window Crystal Structure:

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 Help on Above


Dormann J , Gasperin M , Poullen J F , Bulletin de Mineralogie , 105 (1982) p.147-160, Etude structurale de la sequence d oxydation de la vivianite Fe3(PO4)2*8(H2O)

 

Physical Properties of Metavivianite

Help on Cleavage: Cleavage: {110} Perfect
Help on Color: Color: Leek green, Gray green, Reddish brown.
Help on Density: Density: 2.69
Help on Diaphaneity: Diaphaneity: Opaque to translucent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: yellowish brown
 

Optical Properties of Metavivianite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=1.579, b=1.603, g=1.629, bire=0.0500, 2V(Calc)=90, 2V(Meas)=85.
Help on Pleochroism (x): Pleochroism (x): blue or bluish green.
Help on Pleochroism (y): Pleochroism (y): yellowish green or yellowish green.
Help on Pleochroism (z): Pleochroism (z): yellowish green or yellowish green.
 

Calculated Properties of Metavivianite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.70 gm/cc
note: Specific Gravity of Metavivianite =2.69 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0073380032
Boson Index = 0.9926619968
Help on Photoelectric: Photoelectric: PEMetavivianite = 10.36 barns/electron
U=PEMetavivianite x rElectron Density= 27.98 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Metavivianite is Not Radioactive
 

Metavivianite Classification
Help on Dana Class: Dana Class: 40.03.09.01 (40)Hydrated Phosphates, etc
  (40.03)where (A++)3 (XO4)2 · 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
Help on Strunz Class: 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 £ 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
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
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: