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Mahnertite

A valid IMA mineral species
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07382590017271928816511.jpg
Mahnertite

Cap Garonne Mine, Le Pradet, Toulon, Var, Provence-Alpes-Côte d'Azur, France
01847290017271928859373.jpg
Mahnertite

Fenugu Sibiri Mine, Gonnosfanadiga, South Sardinia Province, Sardinia, Italy
04476150017271928902450.jpg
Mahnertite

Brachbach, Kirchen, Altenkirchen, Rhineland-Palatinate, Germany
01563380017867017673173.jpg
Mahnertite

Cap Garonne Mine, Le Pradet, Toulon, Var, Provence-Alpes-Côte d'Azur, France
01847290017271928859373.jpg
Mahnertite

Fenugu Sibiri Mine, Gonnosfanadiga, South Sardinia Province, Sardinia, Italy
04476150017271928902450.jpg
Mahnertite

Brachbach, Kirchen, Altenkirchen, Rhineland-Palatinate, Germany
07382590017271928816511.jpg
Mahnertite

Cap Garonne Mine, Le Pradet, Toulon, Var, Provence-Alpes-Côte d'Azur, France
01847290017271928859373.jpg
Mahnertite

Fenugu Sibiri Mine, Gonnosfanadiga, South Sardinia Province, Sardinia, Italy
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About MahnertiteHide

08823510017271928947468.jpg
Volker Mahnert
Formula:
NaCu3(AsO4)2Cl · 5H2O
Colour:
Blue to emerald green.
Lustre:
Vitreous
Hardness:
2 - 3
Specific Gravity:
3.33
Crystal System:
Tetragonal
Name:
Named after Volker Mahnert (3 December 1943, Innsbruck, Austria - 23 November 2018, Geneva, Switzerland), zoologist, Director of the Muséum d’Histoire Naturelle, Geneva, Switzerland.
Structurally related to Zdenekite and other members of the Lavendulan Group.

Chemically similar to Unnamed (Na-Cu Arsenate Chloride Hydrate).


Unique IdentifiersHide

Mindat ID:
7165
Long-form identifier:
mindat:1:1:7165:5

Similar NamesHide

MannarditeA valid IMA mineral speciesBa(Ti64+V23+)O16

IMA Classification of MahnertiteHide

IMA status:
Approved
IMA Formula:
(Na,Ca,K)Cu2+3(As5+O4)2Cl(H2O)3·2H2O
Approval year:
1994
First published:
1996
Type description reference:
Sarp, H. (1996) La mahnertite, (Na,Ca)Cu3(AsO4)2Cl·5H2O, un nouveau minéral de la mine de Cap Garonne, Var, France. Archives des Sciences, Genève, 49 (2) 119-124

Classification of MahnertiteHide

Strunz-mindat (2026):
8.DH.45

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
MahIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MahnertiteHide

Lustre:
Vitreous
Transparency:
Translucent
Colour:
Blue to emerald green.
Streak:
Pale blue
Hardness:
2 - 3 on Mohs scale
Cleavage:
Perfect
{001}
Fracture:
Irregular/Uneven
Density:
3.33(2) g/cm3 (Measured)    3.36(1) g/cm3 (Calculated)

Optical Data of MahnertiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.686(2) nε = 1.635(2)
Max. Birefringence:
δ = 0.051
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic (convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis centred and vertical. The coloured rings are isochromatics, computed with the same physics as the Michel-Lévy bar above; the dark cross is the isogyre.

For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Pleochroism:
Strong
Comments:
O = blue to intense green-blue, E = clear blue to clear green.

Chemistry of MahnertiteHide

Mindat Formula:
NaCu3(AsO4)2Cl · 5H2O
Element Weights:
Element% weight
O33.711 %
Cu30.898 %
As24.286 %
Cl5.746 %
Na3.726 %
H1.634 %

Calculated from ideal end-member formula.
O
Cu
As
Cl
Na
H
Elements listed:
As, Cl, Cu, H, Na, O - search for minerals with similar chemistry

Crystallography of MahnertiteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm(4/m2/m2/m) - Ditetragonal Dipyramidal
Space Group:
I4/mmm
Cell Parameters:
a = 10.037 Å, c = 23.739 Å
Ratio:
a:c = 1 : 2.365
Unit Cell V:
2391.5 ų
Z:
8
Morphology:
Thin tetragonal plates. Tabular on {001}, also showing {100}.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0007079MahnertitePushcharovsky D Y, Zubkova N V, Teat S J, Maclean E J, Sarp H (2004) Crystal structure of mahnertite European Journal of Mineralogy 16 687-69220040293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.90 Å(100)
9.29 Å(60)
7.131 Å(50)
5.043 Å(60)
4.641 Å(40)
3.098 Å(80)
3.061 Å(70)

Geological EnvironmentHide

Type Occurrence of MahnertiteHide

Type Locality:
ⓘ Cap Garonne Mine, Le Pradet, Toulon, Var, Provence-Alpes-Côte d'Azur, France
General Appearance of Type Material:
Blue to emerald green aggregates of thin (0.1 mm) square crystals, and as spherules to 0.2 mm in diameter.
Place of Conservation of Type Material:
Natural History Museum, Geneva, Switzerland.
Geological Setting of Type Material:
Oxidation product in a sedimentary-hosted copper deposit.
Associated Minerals at Type Locality:
CovelliteGeminitePushcharovskiteQuartzTennantite Subgroup
Reference:
Sarp, H. (1996) La mahnertite, (Na,Ca)Cu3(AsO4)2Cl·5H2O, un nouveau minéral de la mine de Cap Garonne, Var, France. Archives des Sciences, Genève, 49 (2) 119-124

Synonyms of MahnertiteHide

Other Language Names for MahnertiteHide

German:Mahnertit
Spanish:Mahnertita

Relationship of Mahnertite to other SpeciesHide

Structurally related to group(s):
Lavendulan GroupMahnertite, richelsdorfite, andyrobertsite and calcioandyrobertsite are structurally ...

Common AssociatesHide

Associations Based on Photo Data:
2 photos of Mahnertite associated with PushcharovskiteK0.6Cu18[AsO2(OH)2]4[AsO3OH]10(AsO4)(OH)9.6 · 18.6H2O
2 photos of Mahnertite associated with ZdenĕkiteNaPbCu5(AsO4)4Cl · 5H2O
2 photos of Mahnertite associated with JuansilvaiteNa5Al3[AsO3(OH)]4[AsO2(OH)2]2(SO4)2 · 4H2O
2 photos of Mahnertite associated with CaracoliteNa3Pb2(SO4)3Cl
1 photo of Mahnertite associated with ScoroditeFe3+AsO4 · 2H2O
1 photo of Mahnertite associated with CarminitePbFe3+2(AsO4)2(OH)2
1 photo of Mahnertite associated with BeudantitePbFe3+3(AsO4)(SO4)(OH)6
1 photo of Mahnertite associated with KoritnigiteZn(AsO3OH) · H2O
1 photo of Mahnertite associated with AnglesitePbSO4

Related Minerals - Strunz-mindat GroupingHide

8.DH.Thebaite-(NH4)(NH4)3Al(C2O4)(PO3OH)2(H2O)Mon. 2/m : P21/b
8.DH.Whiteite-(MnMnMn)Mn2+Mn2+Mn2+2Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.Ammoniotinsleyite(NH4)Al2(PO4)2(OH) · 2H2OMon. 2/m : P21/m
8.DH.Bergbauerite(H2O)2Mn2(Fe2Ti)(PO4)4(OH)2(H2O)10 · 4H2OOrth. mmm(2/m2/m2/m) : Pbca
8.DH.Dendoraite-(NH4)(NH4)2NaAl(C2O4)(PO3OH)2(H2O)2Mon. 2/m
8.DH.Rowleyite[Na(NH4,K)9Cl4][V5+,4+2(P,As)O8]6 · n[H2O,Na,NH4,K,Cl]Iso.
8.DH.HochleitneriteMn2Ti3(PO4)4O2(H2O)2 · 14H2OOrth. mmm(2/m2/m2/m) : Pbca
8.DH.Whiteite-(CaMnFe)CaMnFe2Al2(PO4)4(OH)2 · 8H2OMon. 2/m
8.DH.05MinyuliteKAl2(PO4)2F · 4H2OOrth. mm2 : Pba2
8.DH.10LeucophosphiteKFe3+2(PO4)2(OH) · 2H2OMon. 2/m : P21/b
8.DH.10TinsleyiteKAl2(PO4)2(OH) · 2H2OMon.
8.DH.10Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2OMon. 2/m
8.DH.15Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(NaMnMn){Na}{Mn2+}{(Mn2+,Fe3+)2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Whiteite-(MnMnMg)MnMnMg2Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnZn){Ca}{Mn2+}{Zn2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(MnMnMg){Mn2+}{Mn2+}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(MnMnFe){Mn2+}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15'Jahnsite-(CaFeFe)'{Ca}{Fe2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon.
8.DH.15Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15KeckiteCaMn2+(Fe3+Mn2+)Fe3+2(PO4)4(OH)3 · 7H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(NaMnMg){(Na,Ca)}{(Mn2+,Fe3+)}{(Mg,Fe3+)2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15'Jahnsite-(CaMgMg)'{Ca}{Mg}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(MnMnZn){Mn2+}{Mn2+}{Zn2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Whiteite-(CaMgMg)CaMg3Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
8.DH.15Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m
8.DH.15Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
8.DH.15Jahnsite-(MnMnMn){Mn2+}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
8.DH.15'Kaluginite'(Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2OOrth.
8.DH.15Jahnsite-(CaFeMg){Ca}{Fe2+}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Whiteite-(CaMnMn){Ca}{Mn2+}{Mn2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(NaFeMg){Na}{Fe3+}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.20SegeleriteCa2 Mg2 Fe3+2(PO4)4(OH)2 · 8H2OOrth. mmm(2/m2/m2/m) : Pcca
8.DH.20Lun'okite(Mn,Ca)(Mg,Fe,Mn)Al(PO4)2OH · 4H2OOrth. mmm(2/m2/m2/m) : Pbca
8.DH.20Manganosegelerite(Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2OOrth. mmm(2/m2/m2/m) : Pbca
8.DH.20WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2OOrth. mmm(2/m2/m2/m) : Pbca
8.DH.20JuonniiteCaMgSc(PO4)2(OH) · 4H2OOrth. mmm(2/m2/m2/m) : Pbca
8.DH.20OveriteCaMgAl(PO4)2(OH) · 4H2OOrth. mmm(2/m2/m2/m) : Pbca
8.DH.25CalcioferriteCa4MgFe3+4(PO4)6(OH)4 · 12H2OMon. 2/m : B2/b
8.DH.25ZodaciteCa4Mn2+Fe3+4(PO4)6(OH)4 · 12H2OMon.
8.DH.25FanfaniiteCa4Mn2+Al4(PO4)6(OH)4 · 12H2OMon. 2/m : B2/b
8.DH.25KingsmountiteCa3Mn2+FeAl4(PO4)6(OH)4 · 12H2OTric. 1 : P1
8.DH.25MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2OMon. 2 : B2
8.DH.30PararobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. 2/m : P21/b
8.DH.30RobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. m : Bb
8.DH.30ArseniosideriteCa2Fe3+3(AsO4)3O2 · 3H2OMon. 2/m : B2/b
8.DH.30Sailaufite(Ca,Na,◻)2Mn3+3(AsO4)2(CO3)O2 · 3H2OMon. m : Bm
8.DH.30MitridatiteCa2Fe3+3(PO4)3O2 · 3H2OMon. 2/m : B2/b
8.DH.30KolfaniteCa2Fe3+3O2(AsO4)3 · 2H2OMon.
8.DH.35MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2OOrth. mmm(2/m2/m2/m) : Pbca
8.DH.35Sperlingite (H2O)K(Mn2+Fe3+)(Al2Ti)(PO4)4[O(OH)] [(H2O)9(OH)] · 4H2OMon. 2/m : P21/b
8.DH.35PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2OMon. m
8.DH.35Hydroxylbenyacarite(H2O)2Mn2(Ti2Fe)(PO4)4[O(OH)](H2O)10 · 4H2O Orth. mmm(2/m2/m2/m) : Pbca
8.DH.35MacraeiteK(H2O)Mn2(Fe2Ti)(PO4)4[O(OH)](H2O)10 · 4H2OMon. 2/m : P21/b
8.DH.35Benyacarite(H2O)2Mn2Ti2Fe3+(PO4)4(OF)(H2O)10 · 4H2OOrth. mmm(2/m2/m2/m) : Pbca
8.DH.35Fluormacraeite [(H2O)K]Mn2(Fe2Ti)(PO4)4(OF)(H2O)10 · 4H2OMon. 2/m : P21/b
8.DH.40XanthoxeniteCa4Fe3+2(PO4)4(OH)2 · 3H2OTric. 1 : P1
8.DH.50AndyrobertsiteKCdCu5(AsO4)4(H2AsO4) · 2H2OMon. 2/m : P21/m
8.DH.50CalcioandyrobertsiteKCaCu5(AsO4)4(H2AsO4) · 2H2OMon. 2/m : P21/m
8.DH.55EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2OMon. 2/m
8.DH.60BouazzeriteBi6(Mg,Co)11Fe3+14(AsO4)18(OH)4O12 · 86H2OMon. 2/m
8.DH.65GalliskiiteCa4Al2(PO4)2F8 · 5H2OTric. 1 : P1
8.DH.70JoteiteCa2CuAl(AsO4)[AsO3(OH)]2(OH)2 · 5H2OTric. 1 : P1
8.DH.75KampeliteBa6Mg3Sc8(PO4)12(OH)6 · 7H2OOrth. mmm(2/m2/m2/m) : Pnma
8.DH.80KapundaiteNaCaFe4(PO4)4(OH)3 · 5H2OTric. 1 : P1
8.DH.85VaniniiteCa2Mn2+3Mn3+2O2(AsO4)4 · 2H2OMon. 2/m : P21/b

Fluorescence of MahnertiteHide

In UV light:
Not fluorescent

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.

Internet Links for MahnertiteHide

References for MahnertiteHide

Localities for MahnertiteHide

Showing 9 localities.

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.
Hide all sections | Show all sections

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Chile
 
  • Tarapacá
    • Iquique Province
      • Iquique
SEM-EDS by Joy Desor
France (TL)
 
  • Provence-Alpes-Côte d'Azur
    • Var
      • Toulon
        • Le Pradet
Sarp (1996) +1 other reference
Germany
 
  • Rhineland-Palatinate
    • Altenkirchen
      • Kirchen (Sieg)
Joy Desor (SEM-EDS and Raman analyses)
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
        • Agios Konstantinos (Kamariza)
          • Mercati mines
Wendel et al. (1999) +1 other reference
Rieck (1999)
Italy
 
  • Sardinia
    • South Sardinia Province
      • Gonnosfanadiga
Desor (2017)
Caboni et al. (2018)
Spain
 
  • Andalusia
    • Almería
      • Cuevas del Almanzora
        • Sierra Almagrera
Calvo Rebollar et al. (2022)
USA
 
  • Utah
    • San Juan County
      • Red Canyon Mining District
Kampf et al. (2018)
Quick NavTopAbout MahnertiteUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
 
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