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Vernadite Mineral Data
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General Vernadite Information
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 Chemical Formula: |
(Mn++++,Fe+++,Ca,Na)(O,OH)2•n(H2O) |
| Composition: |
Molecular Weight = 108.16 gm |
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Sodium 2.13 % Na 2.87 % Na2O |
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Calcium 3.71 % Ca 5.18 % CaO |
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Manganese 30.48 % Mn 48.23 % MnO2 |
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Iron 10.33 % Fe 14.76 % Fe2O3 |
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Hydrogen 3.08 % H 27.48 % H2O |
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Oxygen 50.29 % O |
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______ ______ |
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100.00 % 98.52 % = TOTAL OXIDE |
| Empirical Formula: |
Mn4+0.6Fe3+0.2Ca0.1Na0.1O1.5(OH)0.5•1.4(H2O) |
| Environment: |
Marine and fresh water iron-manganese crusts and concretions, often in relict bacterial forms. |
| IMA Status: |
Valid Species (Pre-IMA) 1944 |
| Locality: |
Somewhere in Russia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Vladimir Ivanovich Vernadskii (1863-1945), Russian natrualist and geochemist. |
| Name Pronunciation: |
Vernadite + Pronunciation  |
| Synonym: |
Wad |
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Vernadite Image |
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Images:
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Vernadite Crystallography
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| Axial Ratios: |
a:c = 1:0.28826 |
| Cell Dimensions: |
a = 9.866, c = 2.844, Z = 4; V = 276.83 Den(Calc)= 2.60 |
| Crystal System: |
Tetragonal - Dipyramidal H-M Symbol (4/m) Space Group: I 4/m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.39(1), 2.15(0.6), 3.11(0.6), |
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Physical Properties of Vernadite
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| Color: |
Black, Chocolate brown. |
| Density: |
3 |
| Diaphaneity: |
Opaque |
| Habit: |
Platy - Sheet forms (e.g. micas). |
| Streak: |
chocolate brown |
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Optical Properties of Vernadite
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| Optical Data: |
NCalc= 1.9 - from Gladstone-Dale relationship (KC = 0.3463) where Ncalc=Dcalc*KC+1
NCalc= 2.04 - from Gladstone-Dale relationship (KC = 0.3463) where Ncalc=Dmeas*KC+1
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Calculated Properties of Vernadite
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| Electron Density: |
Bulk Density (Electron Density)=2.59 gm/cc
note: Specific Gravity of Vernadite =2.60 gm/cc.
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| Fermion Index: |
Fermion Index = 0.002485243
Boson Index = 0.997514757 |
| Photoelectric: |
PEVernadite = 11.22 barns/electron
U=PEVernadite x rElectron Density= 29.01 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Vernadite is Not Radioactive |
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Vernadite Classification
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| Dana Class: |
04.04.09.01 (04)Simple Oxides |
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(04.04)with a cation charge of 4+ (A++++ O2) |
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(04.04.09)Dana Group |
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04.04.09.01 Vernadite (Mn,Fe,Ca,Na)(O,OH)2•n(H2O) I 4/m 4/m |
| Strunz Class: |
04.FE.40 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.F - Hydroxides (without V or U) |
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04.FE -Hydroxides with OH, without H2O; sheets of edge-sharing octahedra |
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04.FE.40 Feroxyhyte FeO(OH) Unk Hex |
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04.FE.40 Vernadite (Mn,Fe,Ca,Na)(O,OH)2•n(H2O) I 4/m 4/m |
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Other Vernadite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) |
| See Also: |
Links to other databases for Vernadite :
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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Print or Cut-and-Paste your Vernadite Specimen Label here :
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Vernadite
(Mn++++,Fe+++,Ca,Na)(O,OH)2•n(H2O)
Dana No: 04.04.09.01 Strunz No: 04.FE.40
Locality:
Notes:
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