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Fahleite (Fahleit)

Pictures (1 Images total)

Fahleit auf Gips
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Fahleit auf Gips
hellgelbe, feinkristalline Krusten von Fahleit auf Gips, Tsumeb Mine, Otavi Highlands, Namibia; BB < 1 mm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Namibia/Oshikoto (Otjikoto), Region/Tsumeb/Tsumeb Mine
Mineral: Fahleite
Image: 1588967205
License: Usage for Mineralienatlas project only
Fahleit auf Gips

hellgelbe, feinkristalline Krusten von Fahleit auf Gips, Tsumeb Mine, Otavi Highlands, Namibia; BB < 1 mm
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-05-08
Locality: Tsumeb Mine / Tsumeb / Oshikoto (Otjikoto), Region / Namibia

Collectors Summary

Color grau, graugrün, hellgrün, strohgelb
Solubility +++ Säuren
Crystal System orthorhombisch,

Chemism

Chemical formula

CaZn5Fe3+2(AsO4)6·14H2O

Chemical composition

Arsen, Calcium, Eisen, Zink, Sauerstoff, Wasserstoff

Unit weight: 1564.546268 u; Number of atoms in the formula: 80

Info

Empirical formula:

CaZn5Fe2(AsO4)6·14H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.80

28

35.00

1.0079470

28.2225160
Oxygen

O

38.86

38

47.50

15.9994300

607.9783400
Calcium

Ca

2.56

1

1.25

40.0784000

40.0784000
Iron

Fe

7.14

2

2.50

55.8452000

111.6904000
Zinc

Zn

20.90

5

6.25

65.4094000

327.0470000
Arsenic

As

28.73

6

7.50

74.9216020

449.5296120

Strunz 9th edition incl. updates

8.CH.55

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
H: Mit großen und mittelgroßen Kationen, RO4:H2O < 1:1
55:Fahleit-Gruppe

Lapis Classification

VII/C.11-060

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

Classification by Hölzel

8.CE.310

8: PHOSPHATES ARSENATES VANADATES
C: Phosphates (-Anions +Water)
E: Phosphates, very large: 1,2 Vmed: 2,3
3: very large: 2, Vmed: 2,3 Smolianinovite-Group

Dana 8th edition

40.05.08.02

40: Hydrated Phosphates, etc
05: Hydrated Phosphates, etc with miscellaneous formulae
08: Smolianinovite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

grau, graugrün, hellgrün, strohgelb

Diaphaneity (Transparency)

transparent

max. Birefringence

0.028
Birefringence chart\! Fahleite title=Birefringence chart Fahleite

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

1.628

RI value β

1.631

RI value γ / ε

1.656

Ri mean

1.638

2V angle

Biaxial (+) 39° (berechnet)

Crystallography

Crystal System

orthorhombisch

Cell parameters a (Å)

6.60

Cell parameters b (Å)

11.6

Cell parameters c (Å)

22.0

Cell parameters a/b or c/a

0.569

Cell parameters c/b

1.897

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volumne (ų)

1684.32

X-Ray Powder Diffraction

22(100),
11(100),
3.2(80),
2.9(50),
1.65(20)
XRD chart Fahleite

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

Crystals 3D

Open larger view

Physical Properties

Density (g/cm³)

3.16 (berechnet)

3.085 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Namibia/Oshikoto (Otjikoto), Region/Tsumeb/Tsumeb Mine

Type material

Mineralogische Sammlung, Ruhr-Universität Bochum

Paragenesis of type material

Lavendulan, Cuproadamin, Konichalcit, Tsumcorit, Quarz, Calcit, Gips auf Tennantit-Chalkosin Erz

Preface

Author (Name, Year)

Medenbach & Schmetzer & Abraham, 1988

References

Neues Jahrbuch für Mineralogie, Monatshefte (1988), 167

Other languages

German

Fahleit

English

Fahleite

French

Fahleite

Spanish

Fahleíta

Russian

Фалеит

CNMNC (IMA)-Number

IMA 1982-061

CNMNC symbol

Symbol

Fhl

Locations with GPS information