Ramsdellite Mineral Data + 
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- 4.4.7.1 Ramsdellite MnO2 Pbnm 2/m 2/m 2/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 Ramsdellite Information |
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 Chemical Formula: |
MnO2 | ||
| Composition: |
Molecular Weight = 86.94 gm | ||
| Manganese 63.19 % Mn 100.00 % MnO2 | |||
| Oxygen 36.81 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Mn4+O2 | ||
| Environment: |
Manganese deposits with pyrolucite. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1943 | ||
| Locality: |
Lake Valley, Sierra County, New Mexico. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named after the American mineralogist, Lewis S. Ramsdell (1895-1975), of the University of Michigan, who first described the mineral. | ||
| Synonym: |
ICSD 78331 | ||
| PDF 44-142 | |||
Ramsdellite Image | |||
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Images:
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Ramsdellite Crystallography |
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| Axial Ratios: |
a:b:c =0.4889:1:0.3091 | ||
| Cell Dimensions: |
a = 4.533, b = 9.27, c = 2.866, Z = 4; V = 120.43 Den(Calc)= 4.79 | ||
| Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm | ||
| X Ray Diffraction: |
By Intensity(I/Io): 4.06(1), 2.32(0.65), 2.55(0.6), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Ramsdellite |
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| Cleavage: |
[???] Good | ||
| Color: |
Iron black, Black, Steel gray. | ||
| Density: |
4.37 | ||
| Diaphaniety: |
Opaque | ||
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. | ||
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. | ||
| Habit: |
Massive - Fibrous - Distinctly fibrous fine-grained forms. | ||
| Habit: |
Platy - Sheet forms (e.g. micas). | ||
| Hardness: |
3 - Calcite | ||
| Luster: |
Metallic | ||
| Streak: |
brownish black | ||
Optical Properties of Ramsdellite |
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| Optical Data: |
NCalc= 2.89 - from Gladstone-Dale relationship (KC = 0.394) where Ncalc=Dcalc*KC+1 NCalc= 2.72 - from Gladstone-Dale relationship (KC = 0.394) where Ncalc=Dmeas*KC+1 |
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Calculated Properties of Ramsdellite |
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| Electron Density: |
relectron=4.52 gm/cc |
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| Fermion Index |
Fermion Index = 0.00017 Boson Index = 0.99983 |
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| Photoelectric: |
PERamsdellite = 16.61 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Ramsdellite is Not Radioactive |
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Ramsdellite Classification |
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| Dana Class: |
4.4.7.1 (4)Simple Oxides | ||
| (4.4)with a cation charge of 4+ (A++++ O2) | |||
| (4.4.7)Dana Group | |||
| Strunz Class: |
IV/D.10-10 IV - Oxides | ||
| IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds) | |||
| IV/D.10 - Ramsdellite - Vernadite series | |||
Other Ramsdellite Information |
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| References: |
NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Ramsdellite : 1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 -Athena 4 - Crocoite.com Mineral Locations 5 - EUROmin Project 6 - Glendale Community College 7 -Google Images 8 -Google Scholar 9 -Handbook of Mineralogy (UofA) 10 - HyperPhysics 11 -MinDAT 12 -MinMax(Deutsch) 13 -MinMax(English) 14 -Mineralienatlas (Deutsch) 15 -QUT Mineral Atlas 16 - WWW-MINCRYST 17 - YupRocks 18 -École des Mines de Paris Search for Ramsdellite using: Visit our Advertisers for Ramsdellite : Translate Ramsdellite Mineral Data : Ask about Ramsdellite here : Print or Cut-and-Paste your Ramsdellite Specimen Label here :
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