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General Faheyite Information |
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 Chemical Formula: |
(Mn,Mg)Fe+++2Be2(PO4)4•6(H2O) | ||
| Composition: |
Molecular Weight = 664.98 gm | ||
| Magnesium 0.91 % Mg 1.52 % MgO | |||
| Manganese 6.20 % Mn 8.00 % MnO | |||
| Beryllium 2.71 % Be 7.52 % BeO | |||
| Iron 16.80 % Fe 24.01 % Fe2O3 | |||
| Phosphorus 18.63 % P 42.69 % P2O5 | |||
| Hydrogen 1.82 % H 16.25 % H2O | |||
| Oxygen 52.93 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Mn2+0.75Mg0.25Fe3+2Be2(PO4)4•6(H2O) | ||
| Environment: |
Late-stage secondary mineral in a complex granite pegmatite. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1953 | ||
| Locality: |
Sapucaia pegmatite mine, about 50 km east-southeast of Governador Valadares, Minas Gerais, Brazil. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Joseph John Fahey (1901-1980), American analytical chemist, U.S. Geological Survey, Washington, D.C., USA. | ||
| Name Pronunciation: |
Faheyite  |
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Faheyite Image | |||
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Images:
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Faheyite Crystallography |
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| Axial Ratios: |
a:c = 1:1.69671 | ||
| Cell Dimensions: |
a = 9.43, c = 16, Z = 3; V = 1,232.18 Den(Calc)= 2.69 | ||
| Crystal System: |
Hexagonal - TrapezohedralH-M Symbol (6 2 2) Space Group: P 6222 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 5.72(1), 7.28(0.9), 3.244(0.6), | ||
Physical Properties of Faheyite |
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| Cleavage: |
{???} Perfect | ||
| Color: |
Blue white, Brownish white, White. | ||
| Density: |
2.66 | ||
| Streak: |
white | ||
Optical Properties of Faheyite |
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| Gladstone-Dale: |
CI meas= 0.019 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.03 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2385,KPDmeas= 0.2412,KC= 0.2459 Ncalc = 1.65 - 1.66 |
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| Optical Data: |
Uniaxial (+), w=1.631, e=1.652, bire=0.0210. | ||
Calculated Properties of Faheyite |
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| Electron Density: |
Bulk Density (Electron Density)=2.64 gm/cc note: Specific Gravity of Faheyite =2.66 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.03 Boson Index = 0.97 |
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| Photoelectric: |
PEFaheyite = 7.46 barns/electron U=PEFaheyite x rElectron Density= 19.69 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Faheyite is Not Radioactive |
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Faheyite Classification |
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| Dana Class: |
40.05.03.01 (40)Hydrated Phosphates, etc | ||
| (40.05)with miscellaneous formulae | |||
| (40.05.03)Dana Group | |||
| Strunz Class: |
08.CA.15 08 - PHOSPHATES, ARSENATES, VANADATES | ||
| 08.C - Phosphates without Additional Anions, with H2O | |||
| 08.CA -With small and large/medium cations | |||
Other Faheyite Information |
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| References: |
NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Faheyite : 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 Faheyite using: Visit our Advertisers for Faheyite : A Bijoux Google Search for FaheyiteAdam's Minerals Google Search for Faheyite Cape Minerals Google Search for Faheyite Dakota Matrix Minerals Google Search for Faheyite Excalibur Mineral Corp. Google Search for Faheyite Exceptional Minerals Google Search for Faheyite John Betts Fine Minerals Search for Faheyite McDougall Minerals Google Search for Faheyite Mineral News Website Link Rock and Mineral Shows Google Search for Faheyite Weinrich Minerals, Inc. Google Search for Faheyite Ask about Faheyite here : Print or Cut-and-Paste your Faheyite Specimen Label here :
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