Mahnertite Mineral Data

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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 % Na₂O

Calcium 0.85 % Ca 1.19 % CaO

Copper 30.93 % Cu 38.72 % CuO

Arsenic 26.52 % As 40.68 % As₂O₅

Hydrogen 1.30 % H 11.57 % H₂O

Chlorine 3.89 % Cl 3.89 % Cl

- % Cl -0.88 % -O=Cl₂

Oxygen 32.93 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na_0.88Ca_0.12Cu_2.75(AsO₄)₂Cl_0.62•3.63(H₂O)

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

Comments: Blue mahnertite in quartz.
Location: Cap Garonne Mine, Pradet, Var, Provence-Alpes-Côte d'Azur, France. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

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 - TrapezohedralH-M Symbol (4 2 2) Space Group: I 4mmm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 11.9(1), 3.098(0.8), 3.061(0.7),

Crystal Structure:

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Pushcharovsky D Y , Zubkova N V , Teat S J , Maclean E J , Sarp H , European Journal of Mineralogy , 16 (2004) p.687-692, Crystal structure of mahnertite

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:

PE_Mahnertite= 32.21 barns/electron
U=PE_Mahnertite x rElectron 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 4₁22,P 4₃22 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 4₁22 or P 4₃22 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 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - MinMax(Deutsch)
10 - MinMax(English)
11 - Mineralienatlas (Deutsch)
12 - QUT Mineral Atlas
13 - Ruff.Info

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Print or Cut-and-Paste your Mahnertite Specimen Label here :

Mahnertite

(Na,Ca)Cu++3(AsO4)2Cl•5(H2O)
Dana No: 42.09.04.04 Strunz No: 08.DH.45
Locality:

Notes: