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Maghrebite

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About MaghrebiteHide

Formula:
MgAl2(AsO4)2(OH)2 · 8H2O
Colour:
Colourless
Lustre:
Vitreous
Crystal System:
Triclinic
Name:
Maghrebite is named after the region of North Africa called "Maghreb".
The word "maghreb" is derived from the Arabic al-maghrib, meaning “region where the sun sets”, and originally signified the region lying between the high ranges of the Atlas Mountains in the south, and the Mediterranean Sea.
Today the term is generally used to refer collectively to the African countries of Morocco, Algeria, Tunisia, Libya, and Mauritania.
The As analogue of Gordonite. The first arsenate member of the Laueite Supergroup.


Classification of MaghrebiteHide

Approved
Approval Year:
2005
8.DC.30

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1

Physical Properties of MaghrebiteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Cleavage:
Perfect
on (010)

Optical Data of MaghrebiteHide

Type:
Biaxial (-)
RI values:
nα = 1.562(2) nβ = 1.574(2) nγ = 1.586(2)
Max Birefringence:
δ = 0.024
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic

Chemical Properties of MaghrebiteHide

Formula:
MgAl2(AsO4)2(OH)2 · 8H2O

Crystallography of MaghrebiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.436 Å, b = 7.075 Å, c = 10.5 Å
α = 97.701°, β = 102.021°, γ = 110.295°
Ratio:
a:b:c = 0.768 : 1 : 1.484
Unit Cell V:
361 ų
Morphology:
Crystals are prismatic on [001] to tabular on {010], with dominating {010}, {001} and {110} faces and minor {100} and {011} faces.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.9 Å(100)
6.4 Å(90)
4.90 Å(80)

Type Occurrence of MaghrebiteHide

General Appearance of Type Material:
acute tabular crystals up to 0.2 mm in length, in fan-shaped aggregates
Place of Conservation of Type Material:
Musée Géologique Cantonal, Lausanne, Switzerland (MGL no. 79792, holotype, and MGL nos. 79793 and 79794, co-types)
Geological Setting of Type Material:
Second-stage oxidation products of Co-Ni ores
Associated Minerals at Type Locality:

Synonyms of MaghrebiteHide

Other Language Names for MaghrebiteHide

German:Maghrebit

Relationship of Maghrebite to other SpeciesHide

Other Members of this group:
CésarferreiraiteFe2+ Fe3+2(AsO4)2(OH)2·8H2OTric. 1 : P1

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Maghrebite associated with PharmacoalumiteKAl4(AsO4)3(OH)4 · 6.5H2O
1 photo of Maghrebite associated with Roselite-βCa2(Co2+,Mg)(AsO4)2 · 2H2O

Related Minerals - Nickel-Strunz GroupingHide

8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2OMon.
8.DC.07EuchroiteCu2(AsO4)(OH) · 3H2OOrth. 2 2 2 : P21 21 21
8.DC.10LegranditeZn2(AsO4)(OH) · H2OMon. 2/m : P21/b
8.DC.12StrashimiriteCu8(AsO4)4(OH)4 · 5H2OMon.
8.DC.15ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon.
8.DC.15EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon.
8.DC.15WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15Cobaltarthurite(Co,Mg)Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15BendadaiteFe2+Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15KunatiteCuFe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15UKI-2006-(PO:FeHZn)ZnFe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15UKI-2006-(PO:AlCuFeH)Fe2+Al3+2(PO4)2(OH)2 · 4H2O
8.DC.17KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.
8.DC.20BermaniteMn2+Mn3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P2/b
8.DC.20CoralloiteMn2+Mn3+2(AsO4)2(OH)2 · 4H2OTric. 1 : P1
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2OMon.
8.DC.25FerristrunziteFe3+Fe3+2(PO4)2(OH)3 · 5H2OTric.
8.DC.25FerrostrunziteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric.
8.DC.25MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.25MetavivianiteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25StrunziteMn2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.27BerauniteFe2+Fe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DC.30GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30LaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2OTric.
8.DC.30ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30PseudolaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.30SigloiteFe3+Al2(PO4)2(OH)3 · 7H2OTric.
8.DC.30StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric.
8.DC.30FerrolaueiteFe2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30NordgauiteMnAl2(PO4)2(F,OH)2 · 5H2OTric. 1 : P1
8.DC.32TinticiteFe3+5.34(PO4)3.62(VO4)0.38(OH)4 · 6.7H2OTric. 1 : P1
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2OOrth.
8.DC.40CacoxeniteFe3+24AlO6(PO4)17(OH)12 · 75H2OHex. 6/m : P63/m
8.DC.45Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
8.DC.45Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
8.DC.47KingiteAl3(PO4)2F2(OH) · 7H2OTric.
8.DC.50WavelliteAl3(PO4)2(OH,F)3 · 5H2OOrth. mmm (2/m 2/m 2/m)
8.DC.50AllanpringiteFe3+3(PO4)2(OH)3 · 5H2OMon. 2/m : P21/m
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
8.DC.55MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon.
8.DC.57OgdensburgiteCa2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
8.DC.60Nevadaite(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2OOrth. mmm (2/m 2/m 2/m)
8.DC.60CloncurryiteCu0.5(VO)0.5Al2(PO4)2F2 · 5H2OMon. 2/m : P21/b

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for MaghrebiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
N. Meisser, J. Brugger (2006): "Bouazzerit und Maghrebit, zwei neue Arsenatmineralien aus dem Revier Bou Azzer, Marokko", Lapis 31(7/8), 69-71. (in German)
Meisser, N., Brugger, J., Krivovichev, S., Armbruster, T. & Favreau, G. (2012): Description and crystal structure of maghrebite, MgAl2(AsO4)2(OH)2.8H2O, from Aghbar, Anti-Atlas, Morocco: first arsenate in the laueite mineral group. European Journal of Mineralogy, 24, 717-726.

Internet Links for MaghrebiteHide

Localities for MaghrebiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Morocco
 
  • Drâa-Tafilalet Region
    • Zagora Province
      • Aghbar
Favreau, G., Dietrich, J. E., Meisser, N., Brugger, J., Ait Haddouch, L. & Maacha, L. (2007): Bou Azzer, Morocco. Mineralogical Record 38, 345-407
N. Meisser, J. Brugger (2006): "Bouazzerit und Maghrebit, zwei neue Arsenatmineralien aus dem Revier Bou Azzer, Marokko", Lapis 31(7/8), 69-71; Meisser, N.; Brugger, J.; Krivovichev, S.; Armbruster, T.; Favreau, G. (2012): Description and crystal structure of maghrebite, MgAl2(AsO4)2(OH)2•8H2O, from Aghbar, Anti-Atlas, Morocco: first arsenate in the laueite mineral group. European Journal of Mineralogy 24, 717-726.
      • Aït Ahmane
Georges FAVREAU collection
      • Oumlil
JP Barral collection
Vincent Bourgoin, EDS analysis, September 2014.
 
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