Maghrebite Mineral Data

General Maghrebite Information

Chemical Formula:

MgAl2(AsO4)2(OH)2•8H2O

Composition:

Molecular Weight = 534.24 gm

Magnesium 4.55 % Mg 7.54 % MgO

Aluminum 10.10 % Al 19.09 % Al₂O₃

Arsenic 28.05 % As 43.02 % As₂O₅

Hydrogen 3.40 % H 30.35 % H₂O

Oxygen 53.91 % O

______ ______

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

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 - PedialH-M Symbol (1) Space Group: P1

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

By Intensity(I/I_o): 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),

Optical Properties of Maghrebite

Optical Data:

NCalc= 2.12 - from Gladstone-Dale relationship (KC = 0.2275) where Ncalc=Dcalc*KC+1

Calculated Properties of Maghrebite

Electron Density:

Bulk Density (Electron Density)=4.89 gm/cc
note: Specific Gravity of Maghrebite =4.91 gm/cc.

Fermion Index:

Fermion Index = 0.0048132672
Boson Index = 0.9951867328

Photoelectric:

PE_Maghrebite= 18.74 barns/electron
U=PE_Maghrebite x rElectron Density= 91.65 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Maghrebite is Not Radioactive

Maghrebite Classification

Dana Class:

42.11.14.07 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.14)Vauxite Group

42.11.14.01 Vauxite FeAl2(PO4)2(OH)2•6(H2O) P1 1

42.11.14.02 Paravauxite FeAl2(PO4)2(OH)2•8(H2O) P1 1

42.11.14.03 Sigloite FeAl2(PO4)2(OH)3•5(H2O) P1 1

42.11.14.04 Gordonite MgAl2(PO4)2(OH)2•8(H2O) P1 1

42.11.14.05 Mangangordonite (Mn,Fe,Mg)Al2(PO4)2(OH)2•8(H2O) P1 1

42.11.14.06 Kastningite! (Mn,Fe,Mg)Al2(PO4)2(OH)2•8(H2O) P1 1

42.11.14.07 Maghrebite! MgAl2(AsO4)2(OH)2•8H2O P1 1

Strunz Class:

08.DC.30 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1

08.DC.30 Gordonite MgAl2(PO4)2(OH)2•8(H2O) P1 1

08.DC.30 Ferrolaueite! FeFe2(PO4)2(OH)2•8(H2O) Tri

08.DC.30 Mangangordonite (Mn,Fe,Mg)Al2(PO4)2(OH)2•8(H2O) P1 1

08.DC.30 Laueite MnFe2(PO4)2(OH)2•8(H2O) P1 1

08.DC.30 Sigloite FeAl2(PO4)2(OH)3•5(H2O) P1 1

08.DC.30 Pseudolaueite MnFe2(PO4)2(OH)2•7-8(H2O) P 2₁/a 2/m

08.DC.30 Paravauxite FeAl2(PO4)2(OH)2•8(H2O) P1 1

08.DC.30 Stewartite MnFe2(PO4)2(OH)2•8(H2O) P1 1

08.DC.30 Ushkovite MgFe2(PO4)2(OH)2•8(H2O) P1 1

08.DC.30 Kastningite! (Mn,Fe,Mg)Al2(PO4)2(OH)2•8(H2O) P1 1

08.DC.30 Maghrebite! MgAl2(AsO4)2(OH)2•8H2O P1 1

Other Maghrebite Information

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 :

Maghrebite

MgAl2(AsO4)2(OH)2•8H2O
Dana No: 42.11.14.07 Strunz No: 08.DC.30
Locality:

Notes: