Fahleite Mineral Data + 
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- 40.5.8.1 Smolianinovite (Co,Ni,Mg,Ca)3(Fe,Al)2(AsO4)4·11(H2O) Unk Ortho
- 40.5.8.2 Fahleite Zn5CaFe2(AsO4)6·14(H2O) Unk Ortho
- VII/C.11-10 Phosphophyllite Zn2(Fe,Mn)(PO4)2·4(H2O) P 21/c 2/m
- VII/C.11-20 Hopeite Zn3(PO4)2·4(H2O) P nma 2/m 2/m 2/m
- VII/C.11-30 Parahopeite Zn3(PO4)2·4(H2O) P1 1
- VII/C.11-40 Radovanite! Cu2Fe(AsO4)[AsO2(OH)2]·H2O P nma 2/m 2/m 2/m
- VII/C.11-50 Smolianinovite (Co,Ni,Mg,Ca)3(Fe,Al)2(AsO4)4·11(H2O) Unk Ortho
- VII/C.11-60 Fahleite Zn5CaFe2(AsO4)6·14(H2O) Unk Ortho
General Fahleite Information |
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 Chemical Formula: |
Zn5CaFe+++2(AsO4)6·14(H2O) | ||
| 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 | |||
| Empirical Formula: |
Zn5CaFe3+2(AsO4)6·14(H2O) | ||
| Environment: |
May be the Zn analog of smolianinovite. | ||
| IMA Status: |
Approved IMA 1988 | ||
| Locality: |
Tsumeb, Namibia. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Rolfe Fahle of Munich, Germany, a mineral dealer specializing in Tsumeb specimens. | ||
Fahleite Image | |||
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Images:
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Fahleite Crystallography |
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| Axial Ratios: |
a:b:c =0.546:1:1.8686 | ||
| Cell Dimensions: |
a = 6.4, b = 11.72, c = 21.9, Z = 2; V = 1,642.68 Den(Calc)= 3.16 | ||
| Crystal System: |
OrthorhombicSpace Group: Unk | ||
| X Ray Diffraction: |
By Intensity(I/Io): 11(1), 22(1), 3.2(0.8), | ||
Physical Properties of Fahleite |
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| Cleavage: |
[???] Perfect | ||
| Color: |
Gray, Gray green, Light green, Straw yellow. | ||
| Density: |
2.1 - 3.16, Average = 2.63 | ||
| Diaphaniety: |
Transparent | ||
| Fracture: |
Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite). | ||
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. | ||
| Habit: |
Fibrous - Crystals made up of fibers. | ||
| Hardness: |
2 - Gypsum | ||
| Luster: |
Silky - Pearly | ||
Optical Properties of Fahleite |
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| 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 |
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| 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 |
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| Electron Density: |
relectron=3.04 gm/cc |
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| Fermion Index |
Fermion Index = 0.0103 Boson Index = 0.9897 |
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| Photoelectric: |
PEFahleite = 32.29 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Fahleite is Not Radioactive |
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Fahleite Classification |
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| Dana Class: |
40.5.8.2 (40)Hydrated Phosphates, etc | ||
| (40.5)with miscellaneous formulae | |||
| (40.5.8)Dana Group | |||
| Strunz Class: |
VII/C.11-60 VII - Phosphates, Arsenates and Vanadates | ||
| VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg | |||
| VII/C.11 - Phosphophyllite - Fahleite series | |||
Other Fahleite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Am.Min.,Vol.74,p501,1989) | ||
| See Also: |
Links to other databases for Fahleite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris Search for Fahleite using: Visit our Advertisers for Fahleite : Translate Fahleite Mineral Data : Ask about Fahleite here : Print or Cut-and-Paste your Fahleite Specimen Label here :
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