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Faheyite Mineral Data

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General Faheyite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Mg)Fe+++2Be2(PO4)4•6(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mn2+0.75Mg0.25Fe3+2Be2(PO4)4•6(H2O)
Help on Environment: Environment: Late-stage secondary mineral in a complex granite pegmatite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1953
Help on Locality: Locality: Sapucaia pegmatite mine, about 50 km east-southeast of Governador Valadares, Minas Gerais, Brazil. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Joseph John Fahey (1901-1980), American analytical chemist, U.S. Geological Survey, Washington, D.C., USA.
Help on Name Pronunciation: Name Pronunciation: Faheyite Say FAHEYITE

Faheyite Image

Click Here for Larger   Image in a New Browser Window Images:
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Comments: Cluster of faheyite microcrystals, 0.1 cm across.
Location: Roosevelt group (Rough Rider), Custer, Custer District, Custer Co., South Dakota, USA. Scale: Picture Size 15 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Faheyite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.69671
Help on Cell Dimensions: Cell Dimensions: a = 9.43, c = 16, Z = 3; V = 1,232.18 Den(Calc)= 2.69
Help on Crystal System: Crystal System: Hexagonal - Trapezohedral H-M Symbol (6 2 2) Space Group: P 6222
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.72(1), 7.28(0.9), 3.244(0.6),

Physical Properties of Faheyite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Blue white, Brownish white, White.
Help on Density: Density: 2.66
Help on Streak: Streak: white

Optical Properties of Faheyite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=1.631, e=1.652, bire=0.0210.

Calculated Properties of Faheyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.64 gm/cc
note: Specific Gravity of Faheyite =2.66 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEFaheyite = 7.46 barns/electron
U=PEFaheyite x rElectron Density= 19.69 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Faheyite is Not Radioactive

Faheyite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.05)with miscellaneous formulae
  (40.05.03)Dana Group Faheyite (Mn,Mg)Fe2Be2(PO4)4•6(H2O) P 6222 6 2 2
Help on  Strunz Class: 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
08.CA.15 Faheyite (Mn,Mg)Fe2Be2(PO4)4•6(H2O) P 6222 6 2 2

Other Faheyite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 08.CA.15





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