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Stanfieldite (Stanfieldit)

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Stanfieldit
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Stanfieldit
rötlichbrauner Stanfieldit, Estherville Meteorit (Fall 10. Mai 1879), Emmet Co. Iowa, USA; BB < 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: USA/Iowa/Emmet Co./Estherville Meteorit
Mineral: Stanfieldite
Image: 1579437017
Rating: 3 (votes: 1)
License: Usage for Mineralienatlas project only
Stanfieldit

rötlichbrauner Stanfieldit, Estherville Meteorit (Fall 10. Mai 1879), Emmet Co. Iowa, USA; BB < 1 mm, analysiert

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-01-19
Locality: Estherville Meteorit / Emmet Co. / Iowa / USA

Collectors Summary

Color rötlichbraun
Hardness (Mohs) 4.00 - 5.00
Crystal System monoklin, C2/c

Chemism

Chemical formula

Ca4(Mg,Fe2+)5(PO4)6

Empirical formula (analysis)

Ca4.02(Mg2.91Fe1.74Mn0.18)(PO4)6

Chemical composition

Calcium, Eisen, Magnesium, Phosphor, Sauerstoff

Unit weight: 908.731276782 u; Number of atoms in the formula: 38.85

Info

Empirical formula:

Ca4.02(Mg2.91Fe1.74Mn0.18)(PO4)6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

42.26

24

61.78

15.9994300

383.9863200

Magnesium

Mg

7.78

2.91

7.49

24.3050600

70.7277246

Phosphorus

P

20.45

6

15.44

30.9737612

185.8425672

Calcium

Ca

17.73

4.02

10.35

40.0784000

161.1151680

Manganese

Mn

1.09

0.18

0.46

54.9380499

9.8888490

Iron

Fe

10.69

1.74

4.48

55.8452000

97.1706480

Analysis wt%

P2O5 : 46.60, CaO : 24.60, MgO : 12.90, FeO : 13.80, MnO : 1.40

Strunz 9th edition incl. updates

8.AC.70

8: Phosphate, Arsenate, Vanadate
A: Phosphate, etc., ohne weitere Anionen, ohne H2O
C: Mit mittelgroßen und großen [Kationen]
70:Stanfieldit-Gruppe

Lapis Classification

VII/A.05-020

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
A: Wasserfreie Phosphate [PO4] 3-, ohne fremde Anionen
5: Mittelgroße Kationen: Fe-Mn vorwiegend

Classification by Hölzel

8.AC.830

8: PHOSPHATES ARSENATES VANADATES
A: Phosphates (-anions -water)
C: Phosphates, C medium + large
8: Brianite-Group

Dana 8th edition

38.03.05.01

38: Anhydrous Phosphates, etc
03: Anhydrous Phosphates, etc (A+ B++)3 (XO4)2

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

rötlichbraun

Change in color

blass bläulich wenn angewittert

Diaphaneity (Transparency)

transparent

max. Birefringence

0.012

Birefringence chart\! Stanfieldite title=Birefringence chart Stanfieldite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.619

RI value β

1.622

RI value γ / ε

1.631

Ri mean

1.624

2V angle

Biaxial (+) 50° - 60° (gemessen)

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

22.813

Cell parameters b (Å)

9.993

Cell parameters c (Å)

17.090

Cell parameters a/b or c/a

2.283

Cell parameters c/b

1.710

Cell parameters α

90°

Cell parameters β

99.97

Cell parameters γ

90°

Z

8

Volume (ų)

3837.177

X-Ray Powder Diffraction

8.31(50),
6.01(50),
5.006(30),
3.845(60),
3.747(80),
3.256(30),
2.817(100),
2.505(80)

XRD chart Stanfieldite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4.00 - 5.00

VHN (Hardness Vickers)

340 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.15 (gemessen)

3.146 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

USA/Iowa/Emmet Co./Estherville Meteorit

Type material

Teile des Estherville Meteoriten befinden sich in verschiedenen Instituten.

The Natural History Museum, London, England

Natural History Museum, Paris, Frankreich

Naturhistorisches Museum, Wien, Österreich

Field Museum of Natural History, Chicago, Illinois, USA

Harvard University, Cambridge, Massachusetts, USA

National Museum of Natural History, Washington, D.C., USA

Preface

Occurrences

Eine seltene Komponente einiger Meteoriten

Associations

Olivin, Whitlockit, Farringtonit, Troilit

Name from

Stanley Field (1875-1964), ehemaliger Vorsitzender des Board of Trustees des Field Museum of Natural History, Chicago, Illinois, USA

Author (Name, Year)

Fuchs, 1967

References

Science 158 (1967), 910

Tschermaks Mineralogische und Petrographische Mitteilungen 16 (1971), 79

Other languages

German

Stanfieldit

Spanish

Stanfieldita

French

Stanfieldite

English

Stanfieldite

Russian

Стенфилдит

https://catalogmineralov.ru/mineral/stanfieldite.html

Simplified Chinese

磷镁钙石

CNMNC (IMA)-Number

IMA 1966-045

CNMNC symbol

Symbol

Stf

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 6gal7ACwSEyIs4LjuG1QbQ
GUID (Global unique identifier) ECA506EA-B000-4C48-88B3-82E3B86D506D
Database ID 3605