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Rancieite Mineral Data
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General Rancieite Information
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 Chemical Formula: |
(Ca,Mn++)Mn++++4O9•3(H2O) |
| Composition: |
Molecular Weight = 461.59 gm |
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Calcium 6.51 % Ca 9.11 % CaO |
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Manganese 50.58 % Mn 3.84 % MnO / 75.34 % MnO2 |
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Hydrogen 1.31 % H 11.71 % H2O |
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Oxygen 41.59 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Ca0.75Mn2+0.25Mn4+4O9•3(H2O) |
| Environment: |
In cavities in limonite. |
| IMA Status: |
Valid Species (Pre-IMA) 1859 |
| Locality: |
Rancie, near Vicdessos, Ariege, France. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Rancieite + Pronunciation  |
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Rancieite Image |
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Images:
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Rancieite Crystallography
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| Axial Ratios: |
a:c = 1:2.62237 |
| Cell Dimensions: |
a = 2.86, c = 7.5, Z = 0.22; V = 53.13 Den(Calc)= 3.17 |
| Crystal System: |
Hexagonal Space Group: Unk |
| X Ray Diffraction: |
By Intensity(I/Io): 7.56(1), 3.77(0.2), 2.46(0.12), |
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Physical Properties of Rancieite
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| Cleavage: |
None |
| Color: |
Violet brown, Black, Silver gray. |
| Density: |
3 - 3.2, Average = 3.1 |
| Diaphaneity: |
Transparent to Opaque |
| Habit: |
Lamellar - Thin laminae producing a lamellar structure. |
| Habit: |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) |
| Habit: |
Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite). |
| Hardness: |
2.5-3 - Finger Nail-Calcite |
| Luster: |
Metallic - Dull |
| Streak: |
dark brown |
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Optical Properties of Rancieite
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| Optical Data: |
NCalc= 2.15 - from Gladstone-Dale relationship (KC = 0.3633) where Ncalc=Dcalc*KC+1
NCalc= 2.13 - from Gladstone-Dale relationship (KC = 0.3633) where Ncalc=Dmeas*KC+1
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Calculated Properties of Rancieite
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| Electron Density: |
Bulk Density (Electron Density)=3.07 gm/cc
note: Specific Gravity of Rancieite =3.17 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0002895295
Boson Index = 0.9997104705 |
| Photoelectric: |
PERancieite = 13.83 barns/electron
U=PERancieite x rElectron Density= 42.40 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rancieite is Not Radioactive |
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Rancieite Classification
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| Dana Class: |
07.10.01.01 (07)Multiple Oxides |
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(07.10)Dana Type |
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(07.10.01)Dana Group |
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07.10.01.01 Rancieite (Ca,Mn)Mn4O9•3(H2O) Unk Hex |
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07.10.01.02 Takanelite (Mn,Ca)Mn4O8•(H2O) Unk Hex |
| Strunz Class: |
04.FL.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.FL -Hydroxides with H2O � (OH); sheets of edge-sharing octahedra |
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04.FL.40 Takanelite (Mn,Ca)Mn4O8•(H2O) Unk Hex |
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04.FL.40 Rancieite (Ca,Mn)Mn4O9•3(H2O) Unk Hex |
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Other Rancieite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) |
| See Also: |
Links to other databases for Rancieite :
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 Rancieite Specimen Label here :
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Rancieite
(Ca,Mn++)Mn++++4O9•3(H2O)
Dana No: 07.10.01.01 Strunz No: 04.FL.40
Locality:
Notes:
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