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Fahleite Mineral Data

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General Fahleite Information

Help on Chemical  Formula: Chemical Formula: Zn5CaFe+++2(AsO4)6•14(H2O)
Help on Composition: Composition: Molecular Weight = 1,564.45 gm
   Calcium    2.56 %  Ca    3.58 % CaO
   Zinc      20.90 %  Zn   26.01 % ZnO
   Iron       7.14 %  Fe   10.21 % Fe2O3
   Arsenic   28.73 %  As   44.07 % As2O5
   Hydrogen   1.80 %  H    16.12 % H2O
   Oxygen    38.86 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Zn5CaFe3+2(AsO4)6•14(H2O)
Help on Environment: Environment: May be the Zn analog of smolianinovite.
Help on IMA Status: IMA Status: Approved IMA 1988
Help on Locality: Locality: Tsumeb, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Rolfe Fahle of Munich, Germany, a mineral dealer specializing in Tsumeb specimens.
Help on Name Pronunciation: Name Pronunciation: Fahleite Say FAHLEITE
 

Fahleite Image

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  Fahleite

Comments: Crystalline cleavage fragment of fahleite.
Location: Tsumeb, Oshikoto, Namibia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Fahleite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.546:1:1.8686
Help on Cell Dimensions: Cell Dimensions: a = 6.4, b = 11.72, c = 21.9, Z = 2; V = 1,642.68 Den(Calc)= 3.16
Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 11(1), 22(1), 3.2(0.8),
 

Physical Properties of Fahleite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Gray, Gray green, Light green, Straw yellow.
Help on Density: Density: 2.1 - 3.16, Average = 2.63
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Silky - Pearly
 

Optical Properties of Fahleite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.173 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.202,KPDmeas= 0.2427,KC= 0.207
Ncalc = 1.43 - 1.65
Help on Optical Data: Optical Data: Biaxial (+), a=1.628, b=1.631, g=1.656, bire=0.0280, 2V(Calc)=40, 2V(Meas)=39.
 

Calculated Properties of Fahleite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.04 gm/cc
note: Specific Gravity of Fahleite =3.16 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEFahleite = 32.29 barns/electron
U=PEFahleite x rElectron Density= 98.08 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fahleite is Not Radioactive
 

Fahleite Classification

Help on  Dana Class: Dana Class: 40.05.08.02 (40)Hydrated Phosphates, etc
  (40.05)with miscellaneous formulae
  (40.05.08)Smolianinovite Group
 
40.05.08.01 Smolianinovite (Co,Ni,Mg,Ca)3(Fe,Al)2(AsO4)4•11(H2O) Unk Ortho
 
40.05.08.02 Fahleite Zn5CaFe2(AsO4)6•14(H2O) Unk Ortho
 
40.05.08.03 Barahonaite-(Fe)! (Ca,Cu,Na,Fe,Al)12Fe2(AsO4)8(OH,Cl)x•nH2O P 2/a or Pa Mono
 
40.05.08.04 Barahonaite-(Al)! (Ca,Cu,Na,Fe,Al)12Al2(AsO4)8(OH,Cl)x•nH2O P 2/a or Pa Mono
Help on  Strunz Class: Strunz Class: 08.CH.55 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CH -With large and medium-sized cations, RO4:H2O < 1:1
 
08.CH.55 Fahleite Zn5CaFe2(AsO4)6•14(H2O) Unk Ortho
 
08.CH.55 Smolianinovite (Co,Ni,Mg,Ca)3(Fe,Al)2(AsO4)4•11(H2O) Unk Ortho
 
08.CH.55 IMA2008-048! Zn6(PO4)4•7H2O P1 1
 

Other Fahleite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Am.Min.,Vol.74,p501,1989)
Help on See Also: See Also: Links to other databases for Fahleite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Fahleite

Zn5CaFe+++2(AsO4)6•14(H2O)
Dana No: 40.05.08.02 Strunz No: 08.CH.55
Locality:

 

Notes:

 

 
   
 


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