Stanfieldite Mineral Data

Stanfieldite Mineral Data +

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General Stanfieldite Information

Chemical Formula:

Ca4(Mg,Fe++,Mn)5(PO4)6

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

Empirical Formula:

Ca₄Mg_2.9Fe²⁺_1.7Mn²⁺_0.2(PO₄)₆

Environment:

A rare component of some meteorites.

IMA Status:

Approved IMA 1967

Locality:

Esterville mesosiderite meteorite. Link to MinDat.org Location Data.

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.

Synonym:

ICSD 23642

PDF 20-223

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Stanfieldite Crystallography

Axial Ratios:

a:b:c =1.7263:1:2.2912

Cell Dimensions:

a = 17.267, b = 10.002, c = 22.917, Z = 8; beta = 100.517° V = 3,891.38 Den(Calc)= 3.09

Crystal System:

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

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

By Intensity(I/I_o): 2.817(1), 2.505(0.8), 3.747(0.8),

Physical Properties of Stanfieldite

Color:

Yellow brown, Reddish yellow.

Density:

3.15

Diaphaniety:

Transparent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Optical Properties of Stanfieldite

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

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

Electron Density:

r_electron=3.10 gm/cc
note: r_Stanfieldite=3.15 gm/cc.

Fermion Index

Fermion Index = 0.01043
Boson Index = 0.98957

Photoelectric:

PE_Stanfieldite= 6.75 barns/electron
U=PE_Stanfieldite x r_electron= 20.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Stanfieldite is Not Radioactive

Stanfieldite Classification

Dana Class:

38.3.5.1 (38)Anhydrous Phosphates, etc

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

(38.3.5)Dana Group

38.3.5.1 Stanfieldite Ca4(Mg,Fe,Mn)5(PO4)6 P 2/c 2/m

Strunz Class:

VII/A.05-20 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 Stanfieldite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Stanfieldite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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

Stanfieldite

Ca4(Mg,Fe++,Mn)5(PO4)6
Dana No: 38.3.5.1 Strunz No: VII/A.05-20
Locality:

Notes: