Mahnertite
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About Mahnertite
Formula:
NaCu3(AsO4)2Cl · 5H2O
Lustre:
Vitreous
Hardness:
2 - 3
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.
Classification of Mahnertite
Approved
Approval year:
1994
First published:
1996
7/D.25-27
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
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
H : With large and medium-sized cations, (OH, etc.):RO4 < 1:1
Physical Properties of Mahnertite
Vitreous
Hardness:
2 - 3 on Mohs scale
Optical Data of Mahnertite
Type:
Uniaxial (-)
RI values:
nω = 1.686 nε = 1.635
Max Birefringence:
δ = 0.051

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Chemical Properties of Mahnertite
Formula:
NaCu3(AsO4)2Cl · 5H2O
IMA Formula:
(Na,Ca,K)Cu3(AsO4)2Cl · 5H2O
Crystallography of Mahnertite
Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/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.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0007079 | Mahnertite | Pushcharovsky D Y, Zubkova N V, Teat S J, Maclean E J, Sarp H (2004) Crystal structure of mahnertite European Journal of Mineralogy 16 687-692 | 2004 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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) |
Type Occurrence of Mahnertite
Reference:
Sarp, H. (1996) Mahnertite, (Na,Ca)Cu(AsO4)4Cl.5H2O, a new mineral from the Cap Garonne Mine, Var France. Archs. Sci. Genève: 49(2): 119-124
Synonyms of Mahnertite
Other Language Names for Mahnertite
Relationship of Mahnertite to other Species
Structurally related to group(s):
Lavendulan Group | Mahnertite, richelsdorfite, andyrobertsite and calcioandyrobertsite are structurally ... |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Nickel-Strunz Grouping
8.DH.05 | Minyulite | KAl2(PO4)2(OH,F) · 4H2O | Orth. mm2 : Pba2 |
8.DH.10 | Leucophosphite | KFe3+2(PO4)2(OH) · 2H2O | Mon. 2/m : P21/b |
8.DH.10 | Spheniscidite | (NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2O | Mon. |
8.DH.10 | Tinsleyite | KAl2(PO4)2(OH) · 2H2O | Mon. |
8.DH.15 | Jahnsite-(CaMnFe) | {Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
8.DH.15 | Jahnsite-(CaMnMg) | {Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
8.DH.15 | Jahnsite-(CaMnMn) | {Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
8.DH.15 | Keckite | CaMn2+(Fe3+Mn2+)Fe3+2(PO4)4(OH)3 · 7H2O | Mon. 2/m : P2/b |
8.DH.15 | Rittmannite | {(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2O | Mon. |
8.DH.15 | Whiteite-(CaFeMg) | {Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P21/b |
8.DH.15 | Whiteite-(CaMnMg) | {Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m |
8.DH.15 | Whiteite-(MnFeMg) | {(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P21/b |
8.DH.15 | Jahnsite-(MnMnMn) | {Mn2+}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. |
8.DH.15 | Kaluginite | (Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2O | Orth. |
8.DH.15 | Jahnsite-(CaFeFe) | {Ca}{Fe2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. |
8.DH.15 | Jahnsite-(NaFeMg) | NaFe3+Mg2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
8.DH.15 | Jahnsite-(NaMnMg) | {(Na,Ca)}{(Mn2+,Fe3+)}{(Mg,Fe3+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
8.DH.15 | Jahnsite-(CaMgMg) | {Ca}{Mg}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2O | |
8.DH.20 | Manganosegelerite | (Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2O | Orth. mmm (2/m 2/m 2/m) : Pbca |
8.DH.20 | Overite | CaMgAl(PO4)2(OH) · 4H2O | Orth. mmm (2/m 2/m 2/m) : Pbca |
8.DH.20 | Segelerite | Ca2 Mg2 Fe3+2(PO4)4(OH)2 · 8H2O | Orth. mmm (2/m 2/m 2/m) : Pcca |
8.DH.20 | Wilhelmvierlingite | CaMnFe3+(PO4)2(OH) · 2H2O | Orth. |
8.DH.20 | Juonniite | CaMgSc(PO4)2(OH) · 4H2O | Orth. |
8.DH.25 | Calcioferrite | Ca2Fe3+2(PO4)3(OH) · 7H2O | Mon. 2/m : B2/b |
8.DH.25 | Kingsmountite | Ca3MnFeAl4(PO4)6(OH)4 · 12H2O | Tric. 1 : P1 |
8.DH.25 | Montgomeryite | Ca4MgAl4(PO4)6(OH)4 · 12H2O | Mon. 2 : B2 |
8.DH.25 | Zodacite | Ca4Mn2+Fe3+4(PO4)6(OH)4 · 12H2O | Mon. |
8.DH.30 | Arseniosiderite | Ca2Fe3+3(AsO4)3O2 · 3H2O | Mon. 2/m : B2/b |
8.DH.30 | Kolfanite | Ca2Fe3+3O2(AsO4)3 · 2H2O | Mon. |
8.DH.30 | Mitridatite | Ca2Fe3+3(PO4)3O2 · 3H2O | Mon. 2/m : B2/b |
8.DH.30 | Pararobertsite | Ca2Mn3+3(PO4)3O2 · 3H2O | Mon. 2/m : P21/b |
8.DH.30 | Robertsite | Ca2Mn3+3(PO4)3O2 · 3H2O | Mon. m : Bb |
8.DH.30 | Sailaufite | (Ca,Na,◻)2Mn3+3(AsO4)2(CO3)O2 · 3H2O | Mon. |
8.DH.35 | Mantienneite | KMg2Al2Ti(PO4)4(OH)3 · 15H2O | Orth. |
8.DH.35 | Paulkerrite | K(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2O | Orth. mmm (2/m 2/m 2/m) : Pbca |
8.DH.35 | Benyacarite | (H2O,K)2(Mn2+,Fe2+)2(Fe3+,Ti)2Ti(PO4)4(O,F)2 · 14H2O | Orth. mmm (2/m 2/m 2/m) : Pbca |
8.DH.40 | Xanthoxenite | Ca4Fe3+2(PO4)4(OH)2 · 3H2O | Tric. 1 : P1 |
8.DH.50 | Andyrobertsite | KCdCu5(AsO4)4(H2AsO4) · 2H2O | Mon. |
8.DH.50 | Calcioandyrobertsite | KCaCu5(AsO4)4(H2AsO4) · 2H2O | Mon. 2/m : P21/m |
8.DH.55 | Englishite | K3Na2Ca10Al15(PO4)21(OH)7 · 26H2O | Mon. 2/m |
8.DH.60 | Bouazzerite | Bi6(Mg,Co)11Fe3+14(AsO4)18(OH)4O12 · 86H2O | Mon. 2/m |
Other Information
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 Mahnertite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sarp, H. (1996) Mahnertite, (Na,Ca)Cu(AsO4)4Cl.5H2O, a new mineral from the Cap Garonne Mine, Var France. Archs. Sci. Genève: 49(2): 119-124 (in French, with English abstract).
Wendel, W. and Markl, G. (1999) Lavrion: Mineralogische Klassiker und Raritäten für Sammler. Lapis: 24(7): 34.
Rieck, B. (1999) Seltene Arsenate aus der Kamariza und weitere Neufunde aus Lavrion. Lapis: 24(7): 68.
Mineralogical Record: 28: 486.
Pushcharovsky, D. Yu., Zubkova, N.V., Teat, S.J., MacLean, E.J., and Sarp, H. (2004) Crystal structure of mahnertite. European Journal of Mineralogy: 16: 687-692.
Giester, Gerald; Uwe Kolitsch; Peter Leverett; Peter Turner; Peter A. Williams (2007) The crystal structures of lavendulan, sampleite, and a new polymorph of sampleite. European Journal of Mineralogy: 19: 75-93.
Internet Links for Mahnertite
mindat.org URL:
https://www.mindat.org/min-7165.html
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Localities for Mahnertite
Locality List




All localities listed without proper references should be considered as questionable.
Chile | |
| SEM-EDS by Joy Desor |
France (TL) | |
| H. Sarp: Archs. Sci. Genève 49(2):119-124 (1996) |
Germany | |
| Joy Desor (SEM-EDS and Raman analyses) |
Greece | |
| Lapis, 24(7), 34 (1999); Lapis, 24(7), 68 (1999) |
Lapis No.7/8 1999 p.70-74 | |
Italy | |
| Desor, J. (2017) SEM-EDS analysis on crystals |
Caboni, F., Mamberti, M., Tanca G.A., Vinci, A., Bittarello, E., Marengo, A., Brizio, P., Bracco, R., Baralis, L., Desor, J., and Ciriotti, M.E. (2018) Arseniati, arseniuri e altre novità di Pira Inferida - Fenugu Sibiri, Gonnosfanadiga, Sud Sardegna. Micro, 16, 110-156. | |
USA | |
| Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J., and Čejka, J. (2018) Markeyite, a new calcium uranyl carbonate mineral from the Markey mine, San Juan County, Utah, USA. Mineralogical Magazine, 82, 1089-1100. |
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Cap Garonne Mine, Le Pradet, Var, Provence-Alpes-Côte d'Azur, France