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Helmutwinklerite (Helmutwinklerit)

You find additional Helmutwinklerit specimen at the Geolitho Museum

Collectors Summary

Color farblos, himmelblau
Streak color weiß
Lustre Fettglanz, Glasglanz
Hardness (Mohs) 4.75
Solubility +++ HCl, ++ HNO3, H2SO4
Crystal System triklin, P1

Chemism

Chemical formula

PbZn2(AsO4)2·2H2O

Chemical composition

Arsen, Blei, Zink, Sauerstoff, Wasserstoff

Unit weight: 651.898092 u; Number of atoms in the formula: 19

Info

Empirical formula:

PbZn2(AsO4)2·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.62

4

21.05

1.0079470

4.0317880
Oxygen

O

24.54

10

52.63

15.9994300

159.9943000
Zinc

Zn

20.07

2

10.53

65.4094000

130.8188000
Arsenic

As

22.99

2

10.53

74.9216020

149.8432040
Lead

Pb

31.79

1

5.26

207.2100000

207.2100000

Analysis wt%

Ø As2O5 : 36.42, PbO : 34.20, ZnO : 23.54, CuO : 1.62, H2O : 5.53 (Ref: European Journal of Mineralogy 98)

Strunz 9th edition incl. updates

8.CG.20

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
G: Mit großen und mittelgroßen Kationen, RO4:H2O = 1:1
20:Helmutwinklerit-Gruppe

Lapis Classification

VII/C.31-100

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

Classification by Hölzel

8.DK.400

8: PHOSPHATES ARSENATES VANADATES
D: Phosphates (+Anions +Water)
K: very large=2 - very small-medium=2,3
4: triclinic, Z=1, Helmutwinklerite-Group

Dana 8th edition

40.02.09.02

40: Hydrated Phosphates, etc
02: Hydrated Phosphates, etc where A++ (B++)2 (XO4) · x(H2O)
09: Helmutwinklerite Subgroup

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Tsumcorite group

Optical Properties

Color

farblos, himmelblau

Streak color

weiß

Lustre

Fettglanz, Glasglanz

max. Birefringence

0.17
Birefringence chart\! Helmutwinklerite title=Birefringence chart Helmutwinklerite

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

1.72

RI value β

1.87

RI value γ / ε

1.89

Ri mean

1.827

2V angle

Biaxial (+) 70°

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell parameters a (Å)

5.606

Cell parameters b (Å)

5.610

Cell parameters c (Å)

7.617

Cell parameters a/b or c/a

0.999

Cell parameters c/b

1.358

Cell parameters α

70.18

Cell parameters β

69.92

Cell parameters γ

69.18

Z

1

Volumne (ų)

203.771

X-Ray Powder Diffraction

4.694(90),
4.521(30),
3.468(30),
3.267(100),
3.070(90),
2.892(50),
2.770(80),
2.582(80)
XRD chart Helmutwinklerite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4.75

VHN (Hardness Vickers)

350 (25g)

Density (g/cm³)

5.3

5.312 ( ρ calc. Mineralienatlas )

Radioactivity

keine

Instability

+++ HCl, ++ HNO3, H2SO4

(Co-)Type locality

(Co-)Type locality

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

Type material

Geowissenschaftliche Sammlungen des GZG, Göttingen

Collection number of type material

7.4.127.1

Paragenesis of type material

Tennantit

Preface

Author (Name, Year)

Süsse & Schnorrer, 1980

References

Neues Jahrbuch für Mineralogie, Monatshefte (1980), 118

IMA group assignments

Other languages

German

Helmutwinklerit

Spanish

Helmutwinklerita

French

Helmutwinklerite

English

Helmutwinklerite

Russian

Хельмутвинклерит

CNMNC (IMA)-Number

IMA 1979-010

CNMNC symbol

Symbol

Hwk

Locations with GPS information