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Ferroalluaudite (Ferroalluaudit)

Pictures (2 Images total)

Ferroalluaudit
Views (File:
1264068083
): 1002
Ferroalluaudit
Größe: 70x60 mm; Fundort: Pleasant Valley Pegmatit, Fourmile, Custer District, Custer Co., South Dakota, USA
Copyright: Paul Bongaerts; Contribution: slugslayer
Location: USA/South Dakota/Custer Co./Custer District/Fourmile/Pleasant Valley Pegmatit
Mineral: Ferroalluaudite
Image: 1264068083
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Ferroalluaudit

Größe: 70x60 mm; Fundort: Pleasant Valley Pegmatit, Fourmile, Custer District, Custer Co., South Dakota, USA
Copyright: Paul Bongaerts
Contribution: slugslayer 2010-01-21
Locality: Pleasant Valley Pegmatit / Fourmile / Custer District / Custer Co. / South Dakota / USA
massiver Ferroalluaudit in rotem Quarz
Views (File:
1242076031
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massiver Ferroalluaudit in rotem Quarz
Größe: 65x60x25 mm; Fundort: Angarf-Pegmatit, Tazenakht, Ouarzazate, Marokko
Copyright: Pavel M. Kartashov; Contribution: slugslayer
Location: Marokko/Drâa-Tafilalet, Region/Ouarzazate, Provinz/Amerzgane, Cercle/Ouisselsate, Caïdat/Angarf-Pegmatit
Mineral: Ferroalluaudite
Image: 1242076031
Rating: 3 (votes: 1)
License: Usage for Mineralienatlas project only
massiver Ferroalluaudit in rotem Quarz

Größe: 65x60x25 mm; Fundort: Angarf-Pegmatit, Tazenakht, Ouarzazate, Marokko
Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-05-11
Locality: Angarf-Pegmatit / Ouisselsate, Caïdat / Amerzgane, Cercle / Ouarzazate, Provinz / Drâa-Tafilalet, Region / Marokko

Collectors Summary

Color grünlichschwarz
Streak color graugrün
Hardness (Mohs) 5
Solubility +++ Säuren
Crystal System monoklin, I2/a

Chemism

Chemical formula

NaCaFe2+(Fe2+,Mn2+,Fe3+)2(PO4)3

Chemical composition

Calcium, Eisen, Mangan, Natrium, Phosphor, Sauerstoff

Unit weight: 514.97392374 u; Number of atoms in the formula: 20

Info

Empirical formula:

NaCaFe(Fe0.6Mn0.3Fe0.1)2(PO4)3

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

37.28

12

60.00

15.9994300

191.9931600
Sodium

Na

4.46

1

5.00

22.9897702

22.9897702
Phosphorus

P

18.04

3

15.00

30.9737612

92.9212836
Calcium

Ca

7.78

1

5.00

40.0784000

40.0784000
Manganese

Mn

6.40

0.6

3.00

54.9380499

32.9628299
Iron

Fe

26.03

2.4

12.00

55.8452000

134.0284800

Analysis wt%

P2O5 : 41.93, Fe2O3 : 14.45, FeO : 18.15, MnO : 9.79, MgO : 2.55, CaO : 1.35, Na2O : 9.67, H2O : 1.05 (Ref: Ark.Kemi.Min.Geol.46)

Strunz 9th edition incl. updates

8.AC.10

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

Lapis Classification

VII/A.06-060

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
A: Wasserfreie Phosphate [PO4] 3-, ohne fremde Anionen
6: Mittelgroße und große Kationen: Mg-Mn-Fe-Cu-Zn und Ca-Na; Alluaudit-Gruppe

Classification by Hölzel

8.AC.615

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

IMA status

Mit Anerkennung der CNMNC umbenannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Alluaudite supergroup  ⇒ Alluaudite group

Optical Properties

Color

grünlichschwarz

Streak color

graugrün

max. Birefringence

0.013
Birefringence chart\! Ferroalluaudite title=Birefringence chart Ferroalluaudite

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

1.718

RI value γ / ε

1.731

2V angle

Biaxial (+) nd

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

I2/a

Cell parameters a (Å)

10.89

Cell parameters b (Å)

12.54

Cell parameters c (Å)

6.46

Cell parameters a/b or c/a

0.868

Cell parameters c/b

0.515

Cell parameters α

90°

Cell parameters β

97.55

Cell parameters γ

90°

Z

4

Volumne (ų)

874.533

X-Ray Powder Diffraction

8.22(20),
6.28(70),
5.454(20),
3.489(30),
3.075(30),
2.7175(100),
2.5252(20),
2.0867(20)
XRD chart Ferroalluaudite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.55 (gemessen)

3.911 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

Preface

Author (Name, Year)

Fisher, 1957

References

Mineralogical Magazine 43 (1979), 227

IMA group assignments

Other languages

German

Ferroalluaudit

Spanish

Ferroalluaudita

English

Ferroalluaudite

Russian

Ферроаллюодит

Japanese

鉄ｱﾙｵｰﾄﾞ石

Alternative Name

Alluaudite (of Damour)

Fe-alluaudite

German

Ferro-Alluaudit

Ferro-alluaudite

CNMNC (IMA)-Number

IMA 1987-046a

CNMNC symbol

Symbol

Fald

Locations with GPS information