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Walentaite (Walentait)

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Walentait
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Walentait
Nadelige körnige gelbe Kristalle, Bb = 2 mm; Fundort: White Elephant Mine, Cicero Peak, Pringle, Custer District, Custer Co., South Dakota, USA.
Copyright: Bebo; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A002621, Donator: Klaus Fleck
Location: USA/South Dakota/Custer Co./Custer District/Pringle/White Elephant Mine
Mineral: Walentaite
Image: 1467488832
License: Usage for Mineralienatlas project only
Walentait (SNr: A002621)

Nadelige körnige gelbe Kristalle, Bb = 2 mm; Fundort: White Elephant Mine, Cicero Peak, Pringle, Custer District, Custer Co., South Dakota, USA.
Collection: Lithothek der Münchener Micromounter
Copyright: Bebo
Contribution: Münchener Micromounter 2016-07-02
Locality: White Elephant Mine / Pringle / Custer District / Custer Co. / South Dakota / USA

You find additional Walentait specimen at the Geolitho Museum

Collectors Summary

Color lichtgelb, gelbgrün
Streak color gelb
Hardness (Mohs) 3
Cleavages volkommen {010}
Solubility +++ Säuren
Crystal System orthorhombisch, Immm, Imam, Imm2, Ima2, I222, I212121

Chemism

Chemical formula

H2Ca2Fe3+6(AsO4)5(PO4)3·14H2O

Chemical composition

Arsen, Calcium, Eisen, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 1648.9694836 u; Number of atoms in the formula: 92

Info

Empirical formula:

H2Ca2Fe6(AsO4)5(PO4)3·14H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.83

30

32.61

1.0079470

30.2384100
Oxygen

O

44.63

46

50.00

15.9994300

735.9737800
Phosphorus

P

5.64

3

3.26

30.9737612

92.9212836
Calcium

Ca

4.86

2

2.17

40.0784000

80.1568000
Iron

Fe

20.32

6

6.52

55.8452000

335.0712000
Arsenic

As

22.72

5

5.43

74.9216020

374.6080100

Analysis wt%

Al2O3 : 0.50, Fe2O3 : 28.30, FeO : 3.20, MnO : 3.10, CaO : 2.90, As2O5 : 32.90, P2O5 : 12.50, H2O : 16.60 (Ref: Neues Jahrbuch für Mineralogie, (Monatshefte) 84)

Strunz 9th edition incl. updates

8.CH.05

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

Lapis Classification

VII/C.18-030

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
C: Wasserhaltige Phosphate, ohne fremde Anionen
18: Mittelgroße und große Kationen: Fe-Mn-Zn-Mg und Ca-(NH4) 1+

Classification by Hölzel

8.CE.260

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

Dana 8th edition

40.05.10.01

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

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Walentaite group  ⇒ Walentaite subgroup

Optical Properties

Color

lichtgelb, gelbgrün

Streak color

gelb

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.041
Birefringence chart\! Walentaite title=Birefringence chart Walentaite

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

1.65 - 1.738

RI value β

1.74

RI value γ / ε

1.776 - 1.779

2V angle

Biaxial (+)

Orientation

Y = a, Z = c

Dispersion

nicht wahrnehmbar

Absorption

Z < Y

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm, mm2, 222

Space Group number

71, 74, 44, 46, 23, 24

Space Group

Immm, Imam, Imm2, Ima2, I222, I212121

Cell parameters a (Å)

26.24

Cell parameters b (Å)

10.31

Cell parameters c (Å)

7.38

Cell parameters a/b or c/a

2.545

Cell parameters c/b

0.716

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volumne (ų)

1996.544

X-Ray Powder Diffraction

12.9(100),
9.6(10),
6.56(20),
4.82(20),
4.43(30),
3.00(50),
2.931(20),
2.776(20)
XRD chart Walentaite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

3

VHN (Hardness Vickers)

83 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.72 (gemessen)

2.743 ( ρ calc. Mineralienatlas )

Cleavages

volkommen {010}

Tenacity

spröde

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

USA/South Dakota/Custer Co./Custer District/Pringle/White Elephant Mine

Type material

The Natural History Museum, London, England

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

Collection number of type material

1984,690 (England); 149782, 149783 (USA)

Preface

Name from

Dr. Kurt Walenta (1.12.1927–19.11.2021), Professor der Mineralogie, Universität von Stuttgart, Deutschland

Author (Name, Year)

Dunn & Peacor & Roberts & Campbell & Ramik, 1984

References

Neues Jahrbuch für Mineralogie, Monatshefte (1984), 169

IMA group assignments

Other languages

German

Walentait

French

Walentaite

English

Walentaite

Spanish

Walentaíta

CNMNC (IMA)-Number

IMA 1983-047

CNMNC symbol

Symbol

Wlt

Locations with GPS information