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Faheyite (Faheyit)

Pictures (1 Images total)

Faheyite
Views (File:
1445254081
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Faheyite
White, accicular faheyite xls. FOV is 1.5mm. Collected by Steve and Janet Cares; Locality: Roosevelt group (Rough Rider), Custer, Custer District, Custer Co., South Dakota, USA
Copyright: Jason B. Smith; Contribution: Stefan
Collection: Jason B. Smith
Location: USA/South Dakota/Custer Co./Custer District/Custer/Roosevelt group (Rough Rider)
Mineral: Faheyite
Image: 1445254081
License: Usage for Mineralienatlas project only
Faheyite

White, accicular faheyite xls. FOV is 1.5mm. Collected by Steve and Janet Cares; Locality: Roosevelt group (Rough Rider), Custer, Custer District, Custer Co., South Dakota, USA
Collection: Jason B. Smith
Copyright: Jason B. Smith
Contribution: Stefan 2015-10-19
Locality: Roosevelt group (Rough Rider) / Custer / Custer District / Custer Co. / South Dakota / USA

Collectors Summary

Color blau weiß, bräunlich weiß, weiß
Streak color weiß
Solubility +++ Säuren
Crystal System trigonal, P3121

Chemism

Chemical formula

(Mn,Mg)Fe23+Be2(PO4)4·6H2O

Chemical composition

Beryllium, Eisen, Magnesium, Mangan, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 664.972435825 u; Number of atoms in the formula: 43

Info

Empirical formula:

(Mn0.75Mg0.25)Fe2Be2(PO4)4·6H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.82

12

27.91

1.0079470

12.0953640
Beryllium

Be

2.71

2

4.65

9.0121823

18.0243646
Oxygen

O

52.93

22

51.16

15.9994300

351.9874600
Magnesium

Mg

0.91

0.25

0.58

24.3050600

6.0762650
Phosphorus

P

18.63

4

9.30

30.9737612

123.8950448
Manganese

Mn

6.20

0.75

1.74

54.9380499

41.2035374
Iron

Fe

16.80

2

4.65

55.8452000

111.6904000

Strunz 9th edition incl. updates

8.CA.15

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
A: Mit kleinen und großen/mittelgroßen [Kationen]
15:Faheyit-Gruppe

Lapis Classification

VII/C.02-010

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
C: Wasserhaltige Phosphate, ohne fremde Anionen
2: Kleine und mittelgroße Kationen: Be und Al-Mn-Fe-Cu-Zn-Mg

Classification by Hölzel

8.CA.200

8: PHOSPHATES ARSENATES VANADATES
C: Phosphates (-Anions +Water)
A: Phosphates, C small

Dana 8th edition

40.05.03.01

40: Hydrated Phosphates, etc
05: Hydrated Phosphates, etc with miscellaneous formulae

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

blau weiß, bräunlich weiß, weiß

Streak color

weiß

max. Birefringence

0.021
Birefringence chart\! Faheyite title=Birefringence chart Faheyite

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

1.631

RI value γ / ε

1.652

Ri mean

1.638

2V angle

Uniaxial (+)

Crystallography

Crystal System

trigonal

Class (H-M)

32

Space Group number

152

Space Group

P3121

Cell parameters a (Å)

9.43

Cell parameters b (Å)

-

Cell parameters c (Å)

16.00

Cell parameters a/b or c/a

1.697

Cell parameters c/b

-

Z

3

Volumne (ų)

1232.18

X-Ray Powder Diffraction

7.28(90),
5.72(100),
3.962(50),
3.244(60),
3.085(60),
3.029(60),
2.724(30),
2.673(30)
XRD chart Faheyite

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

Crystals 3D

Open larger view

Physical Properties

Density (g/cm³)

2.66

2.688 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Brasilien/Südosten (Região Sudeste)/Minas Gerais/Doce-Tal/Galiléia/Sapucaia do Norte/Sapucaia Mine

Preface

Author (Name, Year)

Lindberg & Murata, 1953

References

Handbook of Mineralogy (Anthony et al.), 4 (2000), 165

Cooper. M.A. & Hawthorne, F.C. (2015) - The crystal structure of faheyite, Mn2+Fe3+2[Be2(PO4)4](H2O)6: a new twist for the [Be(PΦ4)2] chain. Canadian Mineralogist, 53, 199-208.

Other languages

German

Faheyit

Spanish

Faheyita

English

Faheyite

French

Faheyite

Russian

Фейхиит

Alternative Name

German

Faheylit

Spanish

Faheylita

Faheylite

CNMNC symbol

Symbol

Fah

Locations with GPS information