Schubnelite Mineral Data

Schubnelite Mineral Data +

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General Schubnelite Information

Chemical Formula:

Fe++(V+++++O4)(H2O)

Composition:

Molecular Weight = 188.80 gm

Vanadium 26.98 % V 48.17 % V₂O₅

Iron 29.58 % Fe 42.29 % Fe₂O₃

Hydrogen 1.07 % H 9.54 % H₂O

Oxygen 42.37 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺VO₄·(H₂O)

Environment:

On sandstone.

IMA Status:

Approved IMA 1970

Locality:

Mounana, Gabon. Link to MinDat.org Location Data.

Name Origin:

Named for Henri J. Schubnel (1935-), French mineralogist.

Synonym:

ICSD 87710

PDF 24-542

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Schubnelite Crystallography

Axial Ratios:

a:b:c =1.2136:1:1.2191

Cell Dimensions:

a = 6.59, b = 5.43, c = 6.62, Z = 2; alpha = 125°, beta = 104°, gamma = 84.717° V = 187.48 Den(Calc)= 3.34

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.21(1), 4.47(1), 5.15(0.8),

Crystal Structure:

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Schindler M , Hawthorne F C , American Mineralogist , 84 (1999) p.665-668, Schubnelite, [Fe(VO4)(H2O)], a novel heteropolyhedral framework mineral

Physical Properties of Schubnelite

Color:

Black, Yellowish, Greenish brown.

Density:

3.28

Diaphaniety:

Transparent to Subopaque

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Luster:

Adamantine

Streak:

brown

Optical Properties of Schubnelite

Optical Data:

Biaxial (?)

NCalc= 2.1 - from Gladstone-Dale relationship (KC = 0.3294) where Ncalc=Dcalc*KC+1
NCalc= 2.08 - from Gladstone-Dale relationship (KC = 0.3294) where Ncalc=Dmeas*KC+1

Pleochroism (x):

yellowish brown, orangish brown, or greenish brown.

RL Pleochroism:

Observed.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Schubnelite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
420 nm	19.50	17.30
440 nm	18.40	15.80
460 nm	17.70	15.10
480 nm	17.30	14.70
500 nm	16.30	14.30
520 nm	16.30	13.80
540 nm	15.80	13.40
560 nm	15.60	13.20
580 nm	15.50	13.20
600 nm	15.60	13.00
620 nm	15.00	12.60
640 nm	14.90	12.60

**Calculated Relative Intensity Colors of Schubnelite in Air**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	660%
R₁
R₂

Calculated Properties of Schubnelite

Electron Density:

r_electron=3.22 gm/cc
note: r_Schubnelite=3.34 gm/cc.

Fermion Index

Fermion Index = 0.00715
Boson Index = 0.99285

Photoelectric:

PE_Schubnelite= 14.11 barns/electron
U=PE_Schubnelite x r_electron= 45.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Schubnelite is Not Radioactive

Schubnelite Classification

Dana Class:

47.3.3.1 (47)Vanadium Oxysalts

(47.3)(Hydrated)

(47.3.3)Dana Group

47.3.3.1 Schubnelite Fe(VO4)(H2O) P1 1

Strunz Class:

VII/C.07-10 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.07 - Schubnelite - Warikahnite series

VII/C.07-05 Serrabrancaite! MnPO4·(H2O) C 2/c 2/m

VII/C.07-10 Schubnelite Fe(VO4)(H2O) P1 1

VII/C.07-20 Fervanite Fe4(VO4)4·5(H2O) Unk. Mono

VII/C.07-30 Kolovratite HydrousvanadateofNiandZn ? Mono

VII/C.07-40 Warikahnite Zn3(AsO4)2·2(H2O) P1 1

Other Schubnelite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Schubnelite :
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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Schubnelite

Fe++(V+++++O4)(H2O)
Dana No: 47.3.3.1 Strunz No: VII/C.07-10
Locality:

Notes: