Rankachite Mineral Data

Rankachite Mineral Data +

General Rankachite Information

Chemical Formula:

CaFe++V+++++4W++++++8O36·12(H2O)

Composition:

Molecular Weight = 2,562.65 gm

Calcium 1.56 % Ca 2.19 % CaO

Vanadium 7.95 % V 14.19 % V₂O₅

Iron 2.18 % Fe 2.80 % FeO

Hydrogen 0.94 % H 8.44 % H₂O

Tungsten 57.39 % W 72.38 % WO₃

Oxygen 29.97 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaFe²⁺V⁵⁺₄W₈O₃₆·12(H₂O)

IMA Status:

Approved IMA 1984

Locality:

Link to MinDat.org Location Data.

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Rankachite Crystallography

Axial Ratios:

a:b:c =0.1944:1:0.1297

Cell Dimensions:

a = 8.17, b = 42.02, c = 5.45, Z = 2; V = 1,871.00 Den(Calc)= 4.55

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmmn

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 10.64(1), 5.44(0.7), 4.57(0.6),

Physical Properties of Rankachite

Cleavage:

[100] Perfect, [010] Perfect

Color:

Brownish yellow, Dark brown.

Density:

4.5

Hardness:

2.5 - Finger Nail

Luster:

Adamantine - Greasy

Streak:

light brown

Optical Properties of Rankachite

Gladstone-Dale:

CI meas= 0.063 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.073 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1952,KPDmeas= 0.1974,KC= 0.2106

Optical Data:

Biaxial (-), a=1.77, b=1.925, g=1.97, bire=0.2000, 2V(Calc)=52, 2V(Meas)=58.

Calculated Properties of Rankachite

Electron Density:

r_electron=4.00 gm/cc
note: r_Rankachite=4.50 gm/cc.

Fermion Index

Fermion Index = 0.08278
Boson Index = 0.91722

Photoelectric:

PE_Rankachite= 699.88 barns/electron
U=PE_Rankachite x r_electron=2,797.16 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rankachite is Not Radioactive

Rankachite Classification

Dana Class:

49.3.6.1 (49)Basic and Hydrated Molybdates and Tungstates

(49.3)(Hydrated, containing Hydroxyl or Halogen)

(49.3.6)Dana Group

49.3.6.1 Rankachite CaFeV4W8O36·12(H2O) Pmmn 2/m 2/m 2/m

Strunz Class:

VII/C.34-10 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, molybdophosphates with [MoO4]2- - [PO4]3- and similar

VII/C.34 - Rankachite series

VII/C.34-10 Rankachite CaFeV4W8O36·12(H2O) Pmmn 2/m 2/m 2/m

Other Rankachite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Rankachite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Rankachite Specimen Label here :

Rankachite

CaFe++V+++++4W++++++8O36·12(H2O)
Dana No: 49.3.6.1 Strunz No: VII/C.34-10
Locality:

Notes: