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Schubnelite Mineral Data
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General Schubnelite Information
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 Chemical Formula: |
Fe++(V+++++O4)(H2O) |
| Composition: |
Molecular Weight = 188.80 gm |
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Vanadium 26.98 % V 48.17 % V2O5 |
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Iron 29.58 % Fe 42.29 % Fe2O3 |
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Hydrogen 1.07 % H 9.54 % H2O |
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Oxygen 42.37 % O |
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______ ______ |
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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. |
| Name Pronunciation: |
Schubnelite + Pronunciation  |
| Synonym: |
ICSD 87710 |
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PDF 24-542 |
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Schubnelite Crystallography
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| 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 - Pinacoidal H-M Symbol ( 1) Space Group: P1 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.21(1), 4.47(1), 5.15(0.8), |
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Physical Properties of Schubnelite
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| Color: |
Black, Yellowish, Greenish brown. |
| Density: |
3.28 |
| Diaphaneity: |
Transparent to Subopaque |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Luster: |
Adamantine |
| Streak: |
brown |
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Optical Properties of Schubnelite
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| Optical Data: |
Biaxial (?) |
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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
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 420 nm |
19.50 |
17.30 |
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| 440 nm |
18.40 |
15.80 |
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| 460 nm |
17.70 |
15.10 |
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| 480 nm |
17.30 |
14.70 |
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| 500 nm |
16.30 |
14.30 |
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| 520 nm |
16.30 |
13.80 |
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| 540 nm |
15.80 |
13.40 |
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| 560 nm |
15.60 |
13.20 |
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| 580 nm |
15.50 |
13.20 |
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| 600 nm |
15.60 |
13.00 |
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| 620 nm |
15.00 |
12.60 |
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| 640 nm |
14.90 |
12.60 |
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Calculated Relative Intensity Colors of Schubnelite in Air
Relative
Intensity |
0% |
70% |
100% |
140% |
210% |
280% |
350% |
420% |
490% |
560% |
630% |
660% |
| R1 |
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| R2 |
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Calculated Properties of Schubnelite
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| Electron Density: |
Bulk Density (Electron Density)=3.22 gm/cc
note: Specific Gravity of Schubnelite =3.34 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0071504302
Boson Index = 0.9928495698 |
| Photoelectric: |
PESchubnelite = 14.11 barns/electron
U=PESchubnelite x rElectron Density= 45.42 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Schubnelite is Not Radioactive |
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Schubnelite Classification
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| Dana Class: |
47.03.03.01 (47)Vanadium Oxysalts |
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(47.03)(Hydrated) |
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(47.03.03)Dana Group |
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47.03.03.01 Schubnelite Fe(VO4)(H2O) P1 1 |
| Strunz Class: |
08.CB.35 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.C - Phosphates without Additional Anions, with H2O |
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08.CB -With only medium-sized cations, RO4:H2O = 1:1 |
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08.CB.35 Schubnelite Fe(VO4)(H2O) P1 1 |
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Other Schubnelite Information
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| 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Print or Cut-and-Paste your Schubnelite Specimen Label here :
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Schubnelite
Fe++(V+++++O4)(H2O)
Dana No: 47.03.03.01 Strunz No: 08.CB.35
Locality:
Notes:
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