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Maghrebite Mineral Data
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General Maghrebite Information
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 Chemical Formula: |
MgAl2(AsO4)2(OH)2•8H2O |
| Composition: |
Molecular Weight = 534.24 gm |
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Magnesium 4.55 % Mg 7.54 % MgO |
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Aluminum 10.10 % Al 19.09 % Al2O3 |
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Arsenic 28.05 % As 43.02 % As2O5 |
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Hydrogen 3.40 % H 30.35 % H2O |
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Oxygen 53.91 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
MgAl2(AsO4)2(OH)2•8(H2O) |
| Environment: |
Laueite group. As analogue of Gordonite. |
| IMA Status: |
Proposed IMA 2005 (Dana # Added) |
| Locality: |
Aghbar mine near Bou Azzer, Anti-Atlas, Morocco Link to MinDat.org Location Data. |
| Name Origin: |
Commission on New Minerals, Nomenclature and Classification (CNMNC) |
| Synonym: |
IMA2005-044 |
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Maghrebite Crystallography
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| Axial Ratios: |
a:b:c =0.7683:1:1.484 |
| Cell Dimensions: |
a = 5.436, b = 7.075, c = 10.5, Z = 2; alpha = 97.701°, beta = 102.021°, gamma = 110.295° V = 367.11 Den(Calc)= 4.83 |
| Crystal System: |
Triclinic - Pedial H-M Symbol (1) Space Group: P1 |
| X Ray Diffraction: |
By Intensity(I/Io): 9.9(1), 6.4(0.9), 4.9(0.8),2.622(0.6), 2.885(0.6), 3.198(0.6), 4.08(0.5), 3.314(0.4), |
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Optical Properties of Maghrebite
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| Optical Data: |
NCalc= 2.12 - from Gladstone-Dale relationship (KC = 0.2275) where Ncalc=Dcalc*KC+1
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Calculated Properties of Maghrebite
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| Electron Density: |
Bulk Density (Electron Density)=4.89 gm/cc
note: Specific Gravity of Maghrebite =4.91 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0048132672
Boson Index = 0.9951867328 |
| Photoelectric: |
PEMaghrebite = 18.74 barns/electron
U=PEMaghrebite x rElectron Density= 91.65 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Maghrebite is Not Radioactive |
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Maghrebite Classification
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| Dana Class: |
42.11.14.07 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.11)where (AB)4 (XO4)3 Zq � x(H2O) |
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(42.11.14)Vauxite Group |
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42.11.14.01 Vauxite FeAl2(PO4)2(OH)2•6(H2O) P1 1 |
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42.11.14.02 Paravauxite FeAl2(PO4)2(OH)2•8(H2O) P1 1 |
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42.11.14.03 Sigloite FeAl2(PO4)2(OH)3•5(H2O) P1 1 |
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42.11.14.04 Gordonite MgAl2(PO4)2(OH)2•8(H2O) P1 1 |
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42.11.14.05 Mangangordonite (Mn,Fe,Mg)Al2(PO4)2(OH)2•8(H2O) P1 1 |
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42.11.14.06 Kastningite! (Mn,Fe,Mg)Al2(PO4)2(OH)2•8(H2O) P1 1 |
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42.11.14.07 Maghrebite! MgAl2(AsO4)2(OH)2•8H2O P1 1 |
| Strunz Class: |
08.DC.30 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.D - Phosphates, etc |
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08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1 |
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08.DC.30 Gordonite MgAl2(PO4)2(OH)2•8(H2O) P1 1 |
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08.DC.30 Ferrolaueite! FeFe2(PO4)2(OH)2•8(H2O) Tri |
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08.DC.30 Mangangordonite (Mn,Fe,Mg)Al2(PO4)2(OH)2•8(H2O) P1 1 |
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08.DC.30 Laueite MnFe2(PO4)2(OH)2•8(H2O) P1 1 |
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08.DC.30 Sigloite FeAl2(PO4)2(OH)3•5(H2O) P1 1 |
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08.DC.30 Pseudolaueite MnFe2(PO4)2(OH)2•7-8(H2O) P 21/a 2/m |
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08.DC.30 Paravauxite FeAl2(PO4)2(OH)2•8(H2O) P1 1 |
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08.DC.30 Stewartite MnFe2(PO4)2(OH)2•8(H2O) P1 1 |
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08.DC.30 Ushkovite MgFe2(PO4)2(OH)2•8(H2O) P1 1 |
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08.DC.30 Kastningite! (Mn,Fe,Mg)Al2(PO4)2(OH)2•8(H2O) P1 1 |
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08.DC.30 Maghrebite! MgAl2(AsO4)2(OH)2•8H2O P1 1 |
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Other Maghrebite Information
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| See Also: |
Links to other databases for Maghrebite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Print or Cut-and-Paste your Maghrebite Specimen Label here :
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Maghrebite
MgAl2(AsO4)2(OH)2•8H2O
Dana No: 42.11.14.07 Strunz No: 08.DC.30
Locality:
Notes:
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