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NaCu3(AsO4)2Cl · 5H2O
2 - 3
Named after Volker Mahnert (b. 1943), zoologist, Director of the Muséum d’Histoire Naturelle, Geneva, Switzerland.
Structurally related to Zdenekite and other members of the Lavendulan Group.

Classification of Mahnertite

Approval Year:

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

Physical Properties of Mahnertite

Hardness (Mohs):
2 - 3

Optical Data of Mahnertite

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.
Surface Relief:

Chemical Properties of Mahnertite

NaCu3(AsO4)2Cl · 5H2O
IMA Formula:
(Na,Ca,K)Cu3(AsO4)2Cl · 5H2O
Elements listed in formula:

Crystallography of Mahnertite

Crystal System:
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
Cell Parameters:
a = 10.037 Å, c = 23.739 Å
a:c = 1 : 2.365
Unit Cell Volume:
V 2391.5 ų
Thin pseudotetragonal plates.
X-Ray Powder Diffraction Data:
11.90 (100)
9.29 (60)
7.131 (50)
5.043 (60)
4.641 (40)
3.098 (80)
3.061 (70)

Type Occurrence of Mahnertite

Relationship of Mahnertite to other Species

Structurally related to group(s):
8.DH.05MinyuliteKAl2(PO4)2(OH,F) · 4H2O
8.DH.10LeucophosphiteKFe23+(PO4)2(OH) · 2H2O
8.DH.10Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2O
8.DH.10TinsleyiteKAl2(PO4)2(OH) · 2H2O
8.DH.15Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(MnMnMn){Mn2+}{Mn2+}{Mn22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Kaluginite(Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2O
8.DH.15Jahnsite-(CaFeFe){Ca}{Fe2+}{Fe22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(NaFeMg)NaFe3+Mg2Fe23+(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(NaMnMg){Na}{Mn3+}{Mg2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMgMg){Ca}{Mg}{Mg2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.20Manganosegelerite(Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2O
8.DH.20OveriteCaMgAl(PO4)2(OH) · 4H2O
8.DH.20SegeleriteCa2 Mg2 Fe23+(PO4)4(OH)2 · 8H2O
8.DH.20WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2O
8.DH.20JuonniiteCaMgSc(PO4)2(OH) · 4H2O
8.DH.25CalcioferriteCa2Fe23+(PO4)3(OH) · 7H2O
8.DH.25KingsmountiteCa4(Fe2+,Mn2+)Al4(PO4)6(OH)4 · 12H2O
8.DH.25MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
8.DH.25ZodaciteCa4Mn2+Fe43+(PO4)6(OH)4 · 12H2O
8.DH.30ArseniosideriteCa2Fe33+(AsO4)3O2 · 3H2O
8.DH.30KolfaniteCa2Fe33+O2(AsO4)3 · 2H2O
8.DH.30MitridatiteCa2Fe33+(PO4)3O2 · 3H2O
8.DH.30PararobertsiteCa2Mn33+(PO4)3O2 · 3H2O
8.DH.30RobertsiteCa2Mn33+(PO4)3O2 · 3H2O
8.DH.30Sailaufite(Ca,Na,☐)2Mn33+(AsO4)2(CO3)O2 · 3H2O
8.DH.35MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2O
8.DH.35PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2O
8.DH.35Benyacarite(H2O,K)2(Mn2+,Fe2+)2(Fe3+,Ti)2Ti(PO4)4(O,F)2 · 14H2O
8.DH.40XanthoxeniteCa4Fe23+(PO4)4(OH)2 · 3H2O
8.DH.50AndyrobertsiteKCdCu5(AsO4)4(H2AsO4) · 2H2O
8.DH.50CalcioandyrobertsiteKCaCu5(AsO4)4(H2AsO4) · 2H2O
8.DH.55EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2O
8.DH.60BouazzeriteBi6(Mg,Co)11Fe143+(AsO4)18(OH)4O12 · 86H2O

Other Names for Mahnertite

Name in Other Languages:

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:
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. & 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 URL:
Please feel free to link to this page.

Localities for Mahnertite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
France (TL)
  • Provence-Alpes-Côte d'Azur
    • Var
      • Le Pradet
H. Sarp: Archs. Sci. Genève 49(2):119-124 (1996)
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
          • Kamariza Mines (Kamareza Mines)
Lapis, 24(7), 34 (1999); Lapis, 24(7), 68 (1999)
Lapis No.7/8 1999 p.70-74
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