Faheyite Mineral Data

General Faheyite Information

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⁺_0.75Mg_0.25Fe³⁺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

Faheyite Image

Images:

Faheyite

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

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 5.72(1), 7.28(0.9), 3.244(0.6),

Physical Properties of Faheyite

Cleavage:

{???} Perfect

Color:

Blue white, Brownish white, White.

Density:

2.66

Streak:

white

Optical Properties of Faheyite

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

Optical Data:

Uniaxial (+), w=1.631, e=1.652, bire=0.0210.

Calculated Properties of Faheyite

Electron Density:

Bulk Density (Electron Density)=2.64 gm/cc
note: Specific Gravity of Faheyite =2.66 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Faheyite= 7.46 barns/electron
U=PE_Faheyite x rElectron Density= 19.69 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Faheyite is Not Radioactive

Faheyite Classification

Dana Class:

40.05.03.01 (40)Hydrated Phosphates, etc

(40.05)with miscellaneous formulae

(40.05.03)Dana Group

40.05.03.01 Faheyite (Mn,Mg)Fe2Be2(PO4)4•6(H2O) P 6₂22 6 2 2

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

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:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Faheyite :

A Bijoux Google Search for Faheyite
Adam'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 :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Faheyite

(Mn,Mg)Fe+++2Be2(PO4)4•6(H2O)
Dana No: 40.05.03.01 Strunz No: 08.CA.15
Locality:

Notes: