Farringtonite Mineral Data

Farringtonite Mineral Data +

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General Farringtonite Information

Chemical Formula:

Mg3(PO4)2

Composition:

Molecular Weight = 262.86 gm

Magnesium 27.74 % Mg 46.00 % MgO

Phosphorus 23.57 % P 54.00 % P₂O₅

Oxygen 48.69 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₃(PO₄)₂

IMA Status:

Approved IMA 1961

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 31005

PDF 33-876

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Farringtonite Crystallography

Axial Ratios:

a:b:c =0.9234:1:0.6172

Cell Dimensions:

a = 7.6, b = 8.23, c = 5.08, Z = 2; beta = 94.06° V = 316.95 Den(Calc)= 2.75

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 3.44(1), 3.85(0.9), 4.08(0.5),

Physical Properties of Farringtonite

Cleavage:

[100] Good, [010] Good

Color:

White, Wax yellow.

Density:

2.74

Streak:

white

Optical Properties of Farringtonite

Gladstone-Dale:

CI meas= -0.047 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1992,KPDmeas= 0.1999,KC= 0.1908

Optical Data:

Biaxial (+), a=1.54, b=1.544, g=1.559, bire=0.0190, 2V(Calc)=56, 2V(Meas)=54-55.

Calculated Properties of Farringtonite

Electron Density:

r_electron=2.72 gm/cc
note: r_{Farringtonite}=2.75 gm/cc.

Fermion Index

Fermion Index = 0.02797
Boson Index = 0.97203

Photoelectric:

PE_{Farringtonite}= 1.74 barns/electron
U=PE_{Farringtonite} x r_electron= 4.73 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Farringtonite is Not Radioactive

Farringtonite Classification

Dana Class:

38.3.1.2 (38)Anhydrous Phosphates, etc

(38.3)(A+ B++)3 (XO4)2

(38.3.1)Dana Group

38.3.1.1 Sarcopside (Fe,Mn,Mg)3(PO4)2 P 2₁/a 2/m

38.3.1.2 Farringtonite Mg3(PO4)2 P 2₁/a 2/m

Strunz Class:

VII/A.05-10 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions. cations of medium size: Mostly Fe, Mn

VII/A.05 - Farringtonite - Strontiowhitlockite series

VII/A.05-10 Farringtonite Mg3(PO4)2 P 2₁/a 2/m

VII/A.05-20 Stanfieldite Ca4(Mg,Fe,Mn)5(PO4)6 P 2/c 2/m

VII/A.05-30 Panethite (Na,Ca,K)2(Mg,Fe,Mn)2(PO4)2 P 2₁/n 2/m

VII/A.05-40 Brianite Na2CaMg(PO4)2 P 2₁/a 2/m

VII/A.05-46 Tuite! Ca3(PO4)2 R 3m 3m

VII/A.05-50 Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m

VII/A.05-60 Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m

Other Farringtonite 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 Farringtonite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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

Farringtonite

Mg3(PO4)2
Dana No: 38.3.1.2 Strunz No: VII/A.05-10
Locality:

Notes: