Mineralogy Database

Stanfieldite Mineral Data

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General Stanfieldite Information

Help on Chemical  Formula: Chemical Formula: Ca4(Mg,Fe++,Mn)5(PO4)6
Help on Composition: Composition: Molecular Weight = 906.55 gm
   Calcium     17.68 %  Ca   24.74 % CaO
   Magnesium    7.78 %  Mg   12.89 % MgO
   Manganese    1.21 %  Mn    1.56 % MnO
   Iron        10.47 %  Fe   13.47 % FeO
   Phosphorus  20.50 %  P    46.97 % P2O5
   Oxygen      42.36 %  O
              ______        ______ 
              100.00 %       99.65 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca4Mg2.9Fe2+1.7Mn2+0.2(PO4)6
Help on Environment: Environment: A rare component of some meteorites.
Help on IMA Status: IMA Status: Approved IMA 1967
Help on Locality: Locality: Esterville mesosiderite meteorite. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Stanley Field (1875-1964), former Chairman of the Board of Turstees of the Field Museum of Natural History, Chicago, Illinois, USA.
Help on Name Pronunciation: Name Pronunciation: Stanfieldite + Pronunciation Say STANFIELDITE
Help on Synonym: Synonym: ICSD 23642
  PDF 20-223

Stanfieldite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: B&W BSE image of a fragment of stanfieldite in an epoxy grain mount.
Location: Brahin Meteorite, Pallasite, Minsk, Belarus (1810). Scale: See Image.
© Diederik Visser

Stanfieldite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7263:1:2.2912
Help on Cell Dimensions: Cell Dimensions: a = 17.267, b = 10.002, c = 22.917, Z = 8; beta = 100.517° V = 3,891.38 Den(Calc)= 3.09
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.817(1), 2.505(0.8), 3.747(0.8),

Physical Properties of Stanfieldite

Help on Color: Color: Yellow brown, Reddish yellow.
Help on Density: Density: 3.15
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Stanfieldite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1977,KPDmeas= 0.194,KC= 0.1921
Ncalc = 1.59 - 1.61
Help on Optical Data: Optical Data: Biaxial (+), a=1.594-1.619, b=1.596-1.622, g=1.604-1.631, bire=0.0100-0.0120, 2V(Calc)=54-62, 2V(Meas)=50-60.

Calculated Properties of Stanfieldite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.10 gm/cc
note: Specific Gravity of Stanfieldite =3.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEStanfieldite = 6.75 barns/electron
U=PEStanfieldite x rElectron Density= 20.92 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Stanfieldite is Not Radioactive

Stanfieldite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.03)(A+ B++)3 (XO4)2
  (38.03.05)Dana Group Stanfieldite Ca4(Mg,Fe,Mn)5(PO4)6 P 2/c 2/m
Help on  Strunz Class: Strunz Class: 08.AC.70 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AC -With medium-sized and large cations
08.AC.70 Stanfieldite Ca4(Mg,Fe,Mn)5(PO4)6 P 2/c 2/m

Other Stanfieldite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Stanfieldite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 08.AC.70





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