Stanfieldite Mineral Data (original) (raw)

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 Stanfieldite Image in a New Browser Window Images:

Click Here for Larger Stanfieldite Image Stanfieldite 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 - PrismaticH-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),

Click Here for Large Stanfieldite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
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Help on Above

| | Dickens B , Brown W E , Tschermaks Mineralogische und Petrographische Mitteilungen , 16 (1971) p.79-104, The crystal structure of Ca7Mg9(Ca,Mg)2(PO4)12, Locality: synthetic | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

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:

38.03.05.01 (38)Anhydrous Phosphates, etc

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

(38.03.05)Dana Group

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

Stanfieldite

Ca4(Mg,Fe++,Mn)5(PO4)6
Dana No: 38.03.05.01 Strunz No: 08.AC.70
Locality:

Notes: