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Rankachite

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Formula:
Ca0.5(V4+,V5+)(W6+,Fe3+)2O8(OH) · 2H2O
Colour:
Brown, yellow.
Lustre:
Resinous
Hardness:
Crystal System:
Monoclinic
Name:
Named after the Rankach valley, in which the Clara mine (type locality) is located.
This page provides mineralogical data about Rankachite.


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Classification of RankachiteHide

Approved
7.GB.25

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
B : With additional anions and/or H2O
49.3.6.1

49 : HYDRATED MOLYBDATES AND TUNGSTATES
3 : Hydrated Molybdates and Tungstates Containing Hydroxyl or Halogen
22.5.12

22 : Phosphates, Arsenates or Vanadates with other Anions
5 : Phosphates, arsenates or vanadates with chromate, molybdate, niobate or tantalate

Pronounciation of RankachiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of RankachiteHide

Resinous
Colour:
Brown, yellow.
Hardness:
2½ on Mohs scale
Cleavage:
Perfect
Perfect cleavage parallel to {001}

Optical Data of RankachiteHide

Type:
Biaxial (-)
RI values:
nα = 1.770 nβ = 1.925 nγ = 1.970
2V:
Measured: 58° , Calculated: 52°
Max Birefringence:
δ = 0.200
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
relatively strong

Chemical Properties of RankachiteHide

Formula:
Ca0.5(V4+,V5+)(W6+,Fe3+)2O8(OH) · 2H2O
IMA Formula:
Ca0.5(V4+,V5+)(W6+,Fe3+)2O8(OH) · 2H2O

Crystallography of RankachiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 5.479 Å, b = 8.144 Å, c = 10.627 Å
β = 98.22°
Ratio:
a:b:c = 0.673 : 1 : 1.305
Unit Cell V:
469.3 ų
Z:
2
Morphology:
Tabular on {001} and elongated along [100].
Twinning:
None observed.

Type Occurrence of RankachiteHide

Synonyms of RankachiteHide

Other Language Names for RankachiteHide

German:Rankachit
Spanish:Rankachita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Fluorite1 photo of Rankachite associated with Fluorite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.GB.05LindgreniteCu3(MoO4)2(OH)2Mon. 2/m : P21/m
7.GB.10SzenicsiteCu3(MoO4)(OH)4Orth.
7.GB.15CuprotungstiteCu2(WO4)(OH)2Tet. 4 2 2 : P41 21 2
7.GB.15UM1999-38-WO:CrV(V, Cr, W, O, H) [V:Cr:W ratio about 2:1:3]
7.GB.20Phyllotungstite(H2O,M)x(W,Fe)(O,OH)3 · yH2O (M = Ca, Cs, Pb or K)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
7.GB.30FerrimolybditeFe2(MoO4)3 · nH2OOrth. mmm (2/m 2/m 2/m) : Pmmn
7.GB.35AnthoiniteAlWO3(OH)3Tric. 1
7.GB.35MpororoiteWAlO3(OH)3 · 2(H2O)
7.GB.40Obradovicite-KCu[K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]Orth. mmm (2/m 2/m 2/m) : Pmna
7.GB.45Mendozavilite-NaFe[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2]Mon. 2/m : B2/m
7.GB.45ParamendozaviliteNaAl4Fe7(PO4)5(PMo12O40)(OH)16 · 56H2OMon.
7.GB.50Tancaite-(Ce)FeCe(MoO4)3·3H2O Trig. 3 : R3

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.5.1VauquelinitePb2Cu(CrO4)(PO4)(OH)Mon. 2/m
22.5.2EmbreyitePb5(CrO4)2(PO4)2 · H2OMon.
22.5.3CassedanneitePb5(CrO4)2(VO4)2 · H2OMon.
22.5.4FornacitePb2Cu(CrO4)(AsO4)(OH)Mon. 2/m : P21/b
22.5.5MolybdofornacitePb2Cu(MoO4,CrO4)(AsO4,PO4)(OH)Mon.
22.5.6Mendozavilite-NaFe[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2]Mon. 2/m : B2/m
22.5.7ParamendozaviliteNaAl4Fe7(PO4)5(PMo12O40)(OH)16 · 56H2OMon.
22.5.8Betpakdalite-CaCa[Ca2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O36(OH)]Mon. 2/m : B2/m
22.5.9Betpakdalite-NaCa[Na2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O34(OH)3]Mon. 2/m : B2/m
22.5.10Obradovicite-KCu[K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]Orth. mmm (2/m 2/m 2/m) : Pmna
22.5.11Melkovite[Ca2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O36(OH)]Mon. 2/m : B2/m
22.5.13OlmsteaditeKFe2+2(Nb5+,Ta5+)(PO4)2O2 · 2H2OOrth.
22.5.14JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)Orth.

Other InformationHide

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 RankachiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Walenta, K. & Dunn, P. J. (1984): Rankachit, ein neues Mineral aus der Grube Clara im mittleren Schwarzwald. Neues Jahrbuch für Mineralogie, Monatshefte (1984): (7): 289-295. (in German).
American Mineralogist (1985): 70: 876.
Kolitsch, U. (1999) Ein neues, Vanadium, Chrom und Wolfram enthaltendes Mineral aus einer Rankachit-Paragenese von der Grube Clara im mittleren Schwarzwald. Aufschluss 50, 23-32. (in German).
Kolitsch, U. and M. Götzinger (2000): Some new finds from the Clara mine, middle Black Forest: eulytite, namibite, volborthite, gearksutite, spertiniite, monazite-(La), protasite, sainfeldite, cyanotrichite and vauquelinite. Erzgräber 14, 33-47. (in German).
Walenta, K. & Theye, T. (2005): Iron-poor rankachite from the Clara mine. Der Erzgräber, 19, 58-62 (in German with English abstract).
Kolitsch, U. and G. Giester (2006): Rankachite, an unusual oxidic Ca-Fe-V-W-mineral from the Clara mine, Central Black Forest: crystal structure and revision of symmetry, unit cell and chemical formula. Poster, Annual Meeting of the DGK, Freiburg, Germany, April 3 - 6, 2006; abstract in Z. Kristallogr., Suppl. No. 24, 138.

Internet Links for RankachiteHide

Localities for RankachiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany (TL)
 
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
Neues Jahrb.Min.,Mh,(1984) 289-295; Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German)
Mineral and/or Locality  
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