Rankachite (original) (raw)

A valid IMA mineral species

About RankachiteHide

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Formula:

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

Colour:

Dark brown, brown, brownish yellow, yellow

Lustre:

Sub-Adamantine, Resinous, Dull

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.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:3361:5

75b6284b-37c0-413e-be1d-5cf416799a8e

IMA Classification of RankachiteHide

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IMA Formula:

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

Classification of RankachiteHide

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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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Pronunciation of RankachiteHide

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Pronunciation:

Physical Properties of RankachiteHide

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Sub-Adamantine, Resinous, Dull

Transparency:

Translucent, Opaque

Colour:

Dark brown, brown, brownish yellow, yellow

Cleavage:

Perfect
Perfect cleavage parallel to {001}

Fracture:

Irregular/Uneven

Optical Data of RankachiteHide

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RI values:

_n_α = 1.770 _n_β = 1.925 _n_γ = 1.970

2V:

Measured: 58° , Calculated: 52°

δ = 0.200

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

r << v, relatively strong.

Optical Extinction:

X ⊥ plane of flattening; Z = c.

Comments:

X = Y = yellowish brown; Z = reddish brown to opaque.

Chemistry of RankachiteHide

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Mindat Formula:

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

Crystallography of RankachiteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

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

Morphology:

Tabular on {001} and elongated along [100].

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of RankachiteHide

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General Appearance of Type Material:

Crusts on quartz as well as radiated and rosette-like aggregates of crystal needles.

Place of Conservation of Type Material:

National Museum of Natural History, Washington, D.C., USA, 160380.

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Synonyms of RankachiteHide

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Other Language Names for RankachiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Health Risks:

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

Internet Links for RankachiteHide

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References for RankachiteHide

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Reference List:

**Dunn, Pete J., Fleischer, Michael, Langley, Richard H., Shigley, James E., Zilczer, Janet A. (1985) New mineral names. American Mineralogist, 70 (7-8) 871-881 **p.876

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).

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.

Localities for RankachiteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Chile
Bíobío Concepción Province ⓘ Afloramiento pegmatite	Collao et al. (2009)
Germany (TL)
Baden-Württemberg Freiburg Region Ortenaukreis Oberwolfach ⓘ Clara Mine (TL)	Neues Jahrb.Min. et al. (1984) +1 other reference