Mineralogy Database

Farringtonite Mineral Data

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General Farringtonite Information

Help on Chemical  Formula: Chemical Formula: Mg3(PO4)2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mg3(PO4)2
Help on Environment: Environment: Component in pallasite meteorites, rimming and cementing olivine nodules.
Help on IMA Status: IMA Status: Approved IMA 1961
Help on Locality: Locality: Springwater, Krasnojarsk, Zaisho, Imilac, and Port Orford pallasite meteorites. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Oliver Cummings Farrington (1864-1933), Curator of Geology, Field Museum of Natural History, Chicago, Illinois, USA.
Help on Name Pronunciation: Name Pronunciation: Farringtonite + Pronunciation Say FARRINGTONITE
Help on Synonym: Synonym: ICSD 31005
  PDF 33-876

Farringtonite Image

Click Here for Larger   Image in a New Browser Window Images:
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Comments: B&W BSE image of a fragment of farringtonite mounted in an epoxy grain mount.
Location: Springwater Pallasite, Saskatchewan, Canada (1931). Scale: See Image.
© Diederik Visser

Farringtonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9234:1:0.6172
Help on Cell Dimensions: Cell Dimensions: a = 7.6, b = 8.23, c = 5.08, Z = 2; beta = 94.06° V = 316.95 Den(Calc)= 2.75
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.44(1), 3.85(0.9), 4.08(0.5),

Physical Properties of Farringtonite

Help on Cleavage: Cleavage: {100} Good, {010} Good
Help on Color: Color: White, Wax yellow.
Help on Density: Density: 2.74
Help on Streak: Streak: white

Optical Properties of Farringtonite

Help on Gladstone-Dale: 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
Ncalc = 1.52
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.72 gm/cc
note: Specific Gravity of Farringtonite =2.75 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEFarringtonite = 1.74 barns/electron
U=PEFarringtonite x rElectron Density= 4.73 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Farringtonite is Not Radioactive

Farringtonite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.03)(A+ B++)3 (XO4)2
  (38.03.01)Sarcopside Group Sarcopside (Fe,Mn,Mg)3(PO4)2 P 21/a 2/m Farringtonite Mg3(PO4)2 P 21/a 2/m Chopinite! (Mg,Fe)3(PO4)2 P 21/c 2/m
Help on  Strunz Class: Strunz Class: 08.AB.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AB -With medium-sized cations
08.AB.05 Farringtonite Mg3(PO4)2 P 21/a 2/m

Other Farringtonite Information

Help on References: References: NAME( AntBidBlaNic5) 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 Farringtonite :
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.AB.05





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