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Ranciéite

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Formula:
(Ca,Mn)Mn4O9 · 3H2O
System:
Trigonal
Colour:
Black, brownish, violet.
Lustre:
Metallic
Hardness:
2½ - 3
Name:
Named after its discovery locality, the Le Rancié Mine, Sem, Vicdessos, Ariège, Midi-Pyrénées, France.
Birnessite Group. Rancieite-Takanelite Series.
The calcium analogue of takanelite.

May be confused with todorokite.

Classification of Ranciéite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
4.FL.40

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
L : Hydroxides with H2O +- (OH); sheets of edge-sharing octahedra
7.10.1.1

7 : MULTIPLE OXIDES
10 : AB4X9
7.4.16

7 : Oxides and Hydroxides
4 : Oxides of Be, Mg and the alkaline earths
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Type Occurrence of Ranciéite

Physical Properties of Ranciéite

Metallic
Colour:
Black, brownish, violet.
Streak:
Dark brown
Hardness (Mohs):
2½ - 3

Crystallography of Ranciéite

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
P3
Cell Parameters:
a = 2.485Å, c = 7.485Å
Ratio:
a:c = 1 : 3.012
Unit Cell Volume:
V 40.03 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Flaky
Comment:
Data from Ertl et al. (2005)
X-Ray Powder Diffraction Data:
d-spacingIntensity
9.55 (2)
7.50 (10)
3.71 (5)
2.70 (4)
2.46 (4)
2.34 (4)
2.04 (1)
Comments:
Variable, depending on hydration state. [Reflection at 2.70 (4) questionable?]

Chemical Properties of Ranciéite

Formula:
(Ca,Mn)Mn4O9 · 3H2O
Essential elements:
All elements listed in formula:

Relationship of Ranciéite to other Species

Series:
Forms a series with Takanelite (see here)
Structurally related to group(s):
4.FL.TrébeurdeniteFe22+Fe43+O2(OH)10CO3·3H2O
4.FL.05WoodalliteMg6Cr2(OH)16Cl2 · 4H2O
4.FL.05IowaiteMg6Fe23+(OH)16Cl2 · 4H2O
4.FL.05Jamborite(Ni2+1-x,Cox3+(OH)2-x(SO4)x·nH2O [x ≤ ⅓; n ≤ (1 - x)]
4.FL.05MeixneriteMg6Al2(OH)16(OH)2 · 4H2O
4.FL.05MuskoxiteMg7Fe4O13 · 10H2O
4.FL.05FougèriteFe42+Fe23+(OH)12[CO3]·3H2O
4.FL.10HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2O
4.FL.15KuzeliteCa4Al2(OH)12[SO4] · 6H2O
4.FL.20Aurorite(Mn2+,Ag,Ca)Mn34+O7 · 3H2O
4.FL.20Chalcophanite(Zn,Fe,Mn)Mn3O7 · 3H2O
4.FL.20ErnienickeliteNiMn3O7 · 3H2O
4.FL.20Jianshuiite(Mg,Mn)Mn3O7 · 3H2O
4.FL.25WoodruffiteZn(Mn4+,Mn3+)5O10·3½H2O
4.FL.30Asbolane(Ni,Co)2-xMn4+(O,OH)4 · nH2O
4.FL.35BuseriteNa4Mn14O27 · 21H2O
4.FL.40Takanelite(Mn,Ca)Mn4O9 · H2O
4.FL.45Birnessite(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O
4.FL.55CianciulliiteMn(Mg,Mn)2Zn2(OH)10 · 2-4H2O
4.FL.60JenseniteCu3[TeO6] · 2H2O
4.FL.65LeisingiteCu(Mg,Cu,Fe,Zn)2[TeO6] · 6H2O
4.FL.70Akdalaite4Al2O3 · H2O
4.FL.75Cafetite(Ca,Mg)(Fe,Al)2Ti4O12 · 4H2O
4.FL.80MouriteUMo5O12(OH)10
4.FL.85DeloryiteCu4(UO2)(MoO4)2(OH)6
7.4.1BromelliteBeO
7.4.2BehoiteBe(OH)2
7.4.3ClinobehoiteBe(OH)2
7.4.4ChrysoberylBeAl2O4
7.4.5Magnesiotaaffeite-2N’2SMg3Al8BeO16
7.4.6Magnesiotaaffeite-6N’3SMg2BeAl6O12
7.4.7PericlaseMgO
7.4.8BruciteMg(OH)2
7.4.9SpinelMgAl2O4
7.4.10MeixneriteMg6Al2(OH)16(OH)2 · 4H2O
7.4.11LimeCaO
7.4.12PortlanditeCa(OH)2
7.4.13ChlormayeniteCa12Al14O32Cl2
7.4.14HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2O
7.4.15MarokiteCaMn23+O4
7.4.17HollanditeBa(Mn64+Mn23+)O16
7.4.18Romanèchite(Ba,H2O)2Mn5O10
7.4.19Todorokite(Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)6O12 · 3H2O

Other Names for Ranciéite

Name in Other Languages:
German:Ranciéit
Simplified Chinese:钙硬锰矿
Spanish:Ranciéita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ranciéite

Reference List:
Leymérie (1859): 2: 329.

Lacroix (1910): 4: 24.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 572.

American Mineralogist(1969): 54: 1741-1742.

American Mineralogist (1991): 76: 1426-1430.

Ertl, A., Pertlik, F., Prem, M., Post, J.E., Kim, S.J., Brandstätter. F., Alfschuster, R. (2005): Ranciéite crystals from Friesach, Carinthia, Austria. European Journal of Mineralogy, 17, 163-172.

Post, J.E., Heaney, P.J. & Ertl, A. (2008): Rietveld refinement of the ranciéite structure using synchrotron powder diffraction data. Powder Diffr. 23, 10-14.

Internet Links for Ranciéite

Localities for Ranciéite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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