Mahnertite Mineral Data
General Mahnertite Information
Chemical Formula:
(Na,Ca)Cu++3(AsO4)2Cl•5(H2O)
Composition:
Molecular Weight = 565.01 gm
Sodium 3.58 % Na 4.83 % Na2 O
Calcium 0.85 % Ca 1.19 % CaO
Copper 30.93 % Cu 38.72 % CuO
Arsenic 26.52 % As 40.68 % As2 O5
Hydrogen 1.30 % H 11.57 % H2 O
Chlorine 3.89 % Cl 3.89 % Cl
- %
Cl -0.88 % -O=Cl2
Oxygen 32.93 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Na0.88 Ca0.12 Cu2.75 (AsO4 )2 Cl0.62 •3.63(H2 O)
Environment:
Found in a zone of secondary alteration. Polytype of zdenekite.
IMA Status:
Approved IMA 1995 (Dana # Added)
Locality:
Cap Garonne mine, Var, France. Link to MinDat.org Location Data.
Name Origin:
Named after Volker Mahnert (b. 1943), zoologist, director of the Museum d�Histoire Naturelle, Geneva, Switzerland.
Name Pronunciation:
Mahnertite + Pronunciation
Synonym:
IMA1994-035
Mahnertite Image
Images:
Mahnertite Crystallography
Axial Ratios:
a:c = 1:2.36512
Cell Dimensions:
a = 10.0371, c = 23.739, Z = 8; V = 2,391.55 Den(Calc)= 3.14
Crystal System:
Tetragonal - Trapezohedral H-M Symbol (4 2 2) Space Group: I 4mmm
X Ray Diffraction:
By Intensity(I/Io ): 11.9(1), 3.098(0.8), 3.061(0.7),
Physical Properties of Mahnertite
Color:
Blue, Emerald green.
Density:
3.14
Diaphaneity:
Translucent
Hardness:
2-3 - Gypsum-Calcite
Luster:
Vitreous (Glassy)
Optical Properties of Mahnertite
Gladstone-Dale:
CI meas = -0.079 (Fair) - where the CI = (1-KPDmeas /KC ) CI calc = -0.079 (Fair) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2104,KPDmeas = 0.2104,KC = 0.195 Ncalc = 1.61
Optical Data:
Uniaxial (-), e=1.635, w=1.686, bire=0.0510.
Calculated Properties of Mahnertite
Electron Density:
Bulk Density (Electron Density)=2.99 gm/cc note: Specific Gravity of Mahnertite =3.14 gm/cc.
Fermion Index:
Fermion Index = 0.0001715119 Boson Index = 0.9998284881
Photoelectric:
PEMahnertite = 32.21 barns/electronU=PEMahnertite x r Electron Density= 96.19 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Mahnertite is Not Radioactive
Mahnertite Classification
Dana Class:
42.09.04.04 (42) Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
(42.09) where (A)3 (XO4)2 Zq � x(H2O)
(42.09.04) Dana Group
42.09.04.01 Sampleite NaCaCu5(PO4)4Cl•5(H2O) pseudo TET 2/m 2/m 2/m
42.09.04.02 Lavendulan NaCaCu5(AsO4)4Cl•5(H2O) Unk Ortho
42.09.04.03 Zdenekite NaPbCu5(AsO4)4Cl•5(H2O) P 41 22,P 43 22 4 2 2
42.09.04.04 Mahnertite ! (Na,Ca)Cu3(AsO4)2Cl•5(H2O) I 4mmm 4 2 2
42.09.04.05 Lemanskiite ! NaCaCu5(AsO4)4Cl•5H2O P 41 22 or P 43 22 4 2 2
Strunz Class:
08.DH.45 08 - PHOSPHATES, ARSENATES, VANADATES
08.D - Phosphates, etc
08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1
08.DH.45 Mahnertite ! (Na,Ca)Cu3(AsO4)2Cl•5(H2O) I 4mmm 4 2 2
Other Mahnertite Information
References:
NAME( CanMin, 8/99) PHYS. PROP.(Am.Min, 82:1262, 90:772) OPTIC PROP.(Am.Min.,Vol.82,p1262,1997)
See Also:
Links to other databases for Mahnertite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
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Mahnertite
(Na,Ca)Cu++3(AsO4)2Cl•5(H2O)
Dana No: 42.09.04.04 Strunz No: 08.DH.45
Locality:
Notes:
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