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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 pyrolusite. | ||
| 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. | ||
| Name Pronunciation: |
Ramsdellite + Pronunciation  |
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| Synonym: |
Groutellite - pseudomorph of ramsdellite after groutite | ||
| 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 | ||
| Diaphaneity: |
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: |
Bulk Density (Electron Density)=4.52 gm/cc note: Specific Gravity of Ramsdellite =4.79 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.0001766733 Boson Index = 0.9998233267 |
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| Photoelectric: |
PERamsdellite = 16.61 barns/electron U=PERamsdellite x rElectron Density= 75.02 barns/cc. |
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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: |
04.04.07.01 (04)Simple Oxides | ||
| (04.04)with a cation charge of 4+ (A++++ O2) | |||
| (04.04.07)Dana Group | |||
| Strunz Class: |
04.DB.15a 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate | ||
| 04.D - Metal:Oxygen = 1:2 and similar | |||
| 04.DB -With medium-sized cations; chains of edge-sharing octahedra | |||
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 - EUROmin Project 5 - Ecole des Mines de Paris 6 - GeoScienceWorld 7 - Glendale Community College 8 - Google Images 9 - Google Scholar 10 - Handbook of Mineralogy (MinSocAm) 11 - Handbook of Mineralogy (UofA) 12 - HyperPhysics 13 - MinDAT 14 - Mineralienatlas (Deutsch) 15 - Online Mineral Museum 16 - QUT Mineral Atlas 17 - Ruff.Info 18 - WWW-MINCRYST 19 - YupRocks Search for Ramsdellite using: Visit our Advertisers for Ramsdellite : A Bijoux Google Search for RamsdelliteAdam's Minerals Google Search for Ramsdellite Cape Minerals Google Search for Ramsdellite Dakota Matrix Minerals Google Search for Ramsdellite Excalibur Mineral Corp. Google Search for Ramsdellite Exceptional Minerals Google Search for Ramsdellite John Betts Fine Minerals Search for Ramsdellite McDougall Minerals Google Search for Ramsdellite Mineral News Website Link Rock and Mineral Shows Google Search for Ramsdellite Weinrich Minerals, Inc. Google Search for Ramsdellite Ask about Ramsdellite here : Print or Cut-and-Paste your Ramsdellite Specimen Label here :
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