Vernadite Mineral Data + 
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- 4.4.9.1 Vernadite (Mn,Fe,Ca,Na)(O,OH)2·n(H2O) I 4/m 4/m
- IV/D.10-10 Ramsdellite MnO2 Pbnm 2/m 2/m 2/m
- IV/D.10-15 Akhtenskite MnO2 P 63/mmc 6/m 2/m 2/m
- IV/D.10-20 Nsutite (Mn1-x)(Mnx)(O2-2x)(OH2x)wherex=0.06-0.07 Unk Hex
- IV/D.10-30 Vernadite (Mn,Fe,Ca,Na)(O,OH)2·n(H2O) I 4/m 4/m
General Vernadite Information |
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 Chemical Formula: |
(Mn++++,Fe+++,Ca,Na)(O,OH)2·n(H2O) | ||
| Composition: |
Molecular Weight = 108.16 gm | ||
| Sodium 2.13 % Na 2.87 % Na2O | |||
| Calcium 3.71 % Ca 5.18 % CaO | |||
| Manganese 30.48 % Mn 48.23 % MnO2 | |||
| Iron 10.33 % Fe 14.76 % Fe2O3 | |||
| Hydrogen 3.08 % H 27.48 % H2O | |||
| Oxygen 50.29 % O | |||
| ______ ______ | |||
| 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. | ||
| Synonym: |
Wad | ||
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 - DipyramidalH-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), | ||
Physical Properties of Vernadite |
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| Color: |
Black, Chocolate brown. | ||
| Density: |
3 | ||
| Diaphaniety: |
Opaque | ||
| Habit: |
Platy - Sheet forms (e.g. micas). | ||
| Streak: |
chocolate brown | ||
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: |
relectron=2.59 gm/cc |
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| Fermion Index |
Fermion Index = 0.00248 Boson Index = 0.99752 |
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| Photoelectric: |
PEVernadite = 11.22 barns/electron |
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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: |
4.4.9.1 (4)Simple Oxides | ||
| (4.4)with a cation charge of 4+ (A++++ O2) | |||
| (4.4.9)Dana Group | |||
| Strunz Class: |
IV/D.10-30 IV - Oxides | ||
| IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds) | |||
| IV/D.10 - Ramsdellite - Vernadite series | |||
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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris Search for Vernadite using: Visit our Advertisers for Vernadite : Translate Vernadite Mineral Data : Ask about Vernadite here : Print or Cut-and-Paste your Vernadite Specimen Label here :
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