General Fahleite Information Chemical Formula: |
Zn5CaFe+++2(AsO4)6•14(H2O) |
Composition: |
Molecular Weight = 1,564.45 gm |
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Calcium 2.56 % Ca 3.58 % CaO |
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Zinc 20.90 % Zn 26.01 % ZnO |
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Iron 7.14 % Fe 10.21 % Fe2O3 |
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Arsenic 28.73 % As 44.07 % As2O5 |
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Hydrogen 1.80 % H 16.12 % H2O |
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Oxygen 38.86 % O |
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______ ______ |
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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. |
Name Pronunciation: |
Fahleite |
| | Fahleite Image
Images:
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Fahleite Crystallography 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 Cleavage: |
{???} Perfect |
Color: |
Gray, Gray green, Light green, Straw yellow. |
Density: |
2.1 - 3.16, Average = 2.63 |
Diaphaneity: |
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 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 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 Electron Density: |
Bulk Density (Electron Density)=3.04 gm/cc |
note: Specific Gravity of Fahleite =3.16 gm/cc. Fermion Index: |
Fermion Index = 0.01 |
Boson Index = 0.99 Photoelectric: |
PEFahleite = 32.29 barns/electron |
U=PEFahleite x rElectron Density= 98.08 barns/cc. Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Fahleite is Not Radioactive | Fahleite Classification Dana Class: |
40.05.08.02 (40)Hydrated Phosphates, etc |
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(40.05)with miscellaneous formulae |
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(40.05.08)Smolianinovite Group |
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Strunz Class: |
08.CH.55 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.C - Phosphates without Additional Anions, with H2O |
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08.CH -With large and medium-sized cations, RO4:H2O < 1:1 |
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| Other Fahleite Information 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 - 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 Search for Fahleite using: Visit our Advertisers for Fahleite : A Bijoux Google Search for FahleiteAdam's Minerals Google Search for Fahleite Cape Minerals Google Search for Fahleite Dakota Matrix Minerals Google Search for Fahleite Excalibur Mineral Corp. Google Search for Fahleite Exceptional Minerals Google Search for Fahleite John Betts Fine Minerals Search for Fahleite McDougall Minerals Google Search for Fahleite Mineral News Website Link Rock and Mineral Shows Google Search for Fahleite Weinrich Minerals, Inc. Google Search for Fahleite Ask about Fahleite here : Print or Cut-and-Paste your Fahleite Specimen Label here :
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