Faheyite Mineral Data

Faheyite Mineral Data +

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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)

IMA Status:

Valid Species (Pre-IMA) 1953

Locality:

Link to MinDat.org Location Data.

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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

Optical Data:

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

Calculated Properties of Faheyite

Electron Density:

r_electron=2.64 gm/cc
note: r_Faheyite=2.66 gm/cc.

Fermion Index

Fermion Index = 0.03183
Boson Index = 0.96817

Photoelectric:

PE_Faheyite= 7.46 barns/electron
U=PE_Faheyite x r_electron= 19.69 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Faheyite is Not Radioactive

Faheyite Classification

Dana Class:

40.5.3.1 (40)Hydrated Phosphates, etc

(40.5)with miscellaneous formulae

(40.5.3)Dana Group

40.5.3.1 Faheyite (Mn,Mg)Fe2Be2(PO4)4·6(H2O) P 6₂22 6 2 2

Strunz Class:

VII/C.02-10 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.02 - Faheyite - Gainesite-(NaCs) series

VII/C.02-10 Faheyite (Mn,Mg)Fe2Be2(PO4)4·6(H2O) P 6₂22 6 2 2

VII/C.02-20 Melilite (Ca,Na)2(Al,Mg,Fe)(Si,Al)2O7 P 42₁m 4 2m

VII/C.02-25 Selwynite NaK(Be,Al)Zr2(PO4)4·2(H2O) I 4₁/amd 4/m 2/m 2/m

VII/C.02-35 Gainesite Na2Zr2Be(PO4)4·1-2(H2O) I 4₁/amd 4/m 2/m 2/m

VII/C.02-40 Mccrillisite NaCs(Be,Li)Zr2(PO4)4·1-2(H2O) I 4₁/amd 4/m 2/m 2/m

Other Faheyite Information

References:

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 -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

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

Faheyite

(Mn,Mg)Fe+++2Be2(PO4)4·6(H2O)
Dana No: 40.5.3.1 Strunz No: VII/C.02-10
Locality:

Notes: