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Edwardsite

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Edwardsit
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Edwardsit
bläulicher Edwardsit neben farblosem Niedermayrit, Tsumeb Mine, Tsumeb, Namibia; BB < 1 mm, analysiert mittels REM-EDX, RAMAN und XRD
Copyright: Joy Desor; Contribution: openpit
Location: Namibia/Oshikoto (Otjikoto), Region/Tsumeb/Tsumeb Mine
Mineral: Edwardsite, Niedermayrite
Image: 1582453530
License: Usage for Mineralienatlas project only
Edwardsit  E
Analysed with energy dispersive X-ray spectroscopy EDX
R
Analysed with RAMAN spectroscopy
X
Analysed with X-ray diffraction XRD

bläulicher Edwardsit neben farblosem Niedermayrit, Tsumeb Mine, Tsumeb, Namibia; BB < 1 mm, analysiert mittels REM-EDX, RAMAN und XRD

Copyright: Joy Desor
Contribution: openpit 2020-02-23
Locality: Tsumeb Mine / Tsumeb / Oshikoto (Otjikoto), Region / Namibia

You find additional specimen at the Geolitho Museum

Collectors Summary

Color hellblau
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 3~
Cleavages ausgezeichnet (100)
Fracture uneben
Crystal System monoklin, P21/C

Chemism

Chemical formula

Cu3Cd2(SO4)2(OH)6·4H2O

Additional chem. information

Strukturell verwandt mit Cu and Zn-Sulfat-Mineralien welche Flächen mit Kanten teilenden (CuO2+,Zn)φ6-Oktaedern enthalten.

Chemical composition

Cadmium, Kupfer, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 781.694498 u; Number of atoms in the formula: 39

Info

Empirical formula:

Cu3Cd2(SO4)2(OH)6·4H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.81

14

35.90

1.0079470

14.1112580

Oxygen

O

36.84

18

46.15

15.9994300

287.9897400

Sulfur

S

8.20

2

5.13

32.0655000

64.1310000

Copper

Cu

24.39

3

7.69

63.5463000

190.6389000

Cadmium

Cd

28.76

2

5.13

112.4118000

224.8236000

Analysis wt%

SO3 : 20.35, CuO : 28.06, ZnO : 2.26, CdO : 32.43, H2O : 16.14 (Ref: Mineralogical Magazine 2010)

Strunz 9th edition incl. updates

7.DD.30

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
D: Sulfate (Selenate, etc.) mit weitere Anionen, mit H2O
D: mit mittelgroßen Kationen; Lagen von kantenverknüpften Oktaedern
30:Devillin-Gruppe

Lapis Classification

VI/D.19-004

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
D: Wasserhaltige Sulfate, mit fremden Anionen
19: Mittelgroße und sehr große Kationen

Classification by Hölzel

7.DB.350

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
D: Sulfates (+Anions +Water)
B: Langite-Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

hellblau

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.030

Birefringence chart\! Edwardsite title=Birefringence chart Edwardsite

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

1.74

RI value β

1.762

RI value γ / ε

1.77

Ri mean

1.757

2V angle

Biaxial (+) 62°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/C

Cell parameters a (Å)

10.863

Cell parameters b (Å)

13.129

Cell parameters c (Å)

11.169

Cell parameters a/b or c/a

0.827

Cell parameters c/b

0.851

Cell parameters α

90°

Cell parameters β

113.3

Cell parameters γ

90°

Z

4

Volume (ų)

1463.018

Crystal structure

Struktur bestimmt

X-Ray Powder Diffraction

9.991(90), 5.001(90), 4.591(45), 3.332(60), 2.824(40), 2.769(55), 2.670(47)

XRD chart Edwardsite

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)

3~

VHN (Hardness Vickers)

108 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.53 (berechnet)

3.549 ( ρ calc. Mineralienatlas )

Cleavages

ausgezeichnet (100)

Fracture

uneben

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Australien/New South Wales/Yancowinna Co./Broken Hill/Block 14 Opencut

Type material

South Australian Museum, Adelaide

Collection number of type material

G32703

Paragenesis of type material

Niedermayrit, Christelit

Preface

Associations

Kristalle bis 0.06 mm, neben Niedermayrit und Christelit

Name from

dem australischen Mineralogen und Petrologen Austin Burton Edwards (1909-1960) in Anerkennung seiner Arbeiten zur Geologie, Geochemie und Mineralogie australischer Erzlagerstätten (darunter 18 Beiträge zu Broken Hill).

Author (Name, Year)

P. Elliott, J. Brugger, und T. Caradoc-Davies, 2010

References

P. Elliott, J. Brugger, and T. Caradoc-Davies: Description and crystal structure of a new mineral, edwardsite, Cu3Cd2(SO4)2(OH)6•4H2O, from Broken Hill, New South Wales. Mineral. Mag. 74 (2010) S. 39-53.

Neue Mineralien - IMA Web-Seite Sept. 2009
Mineralien Welt 04/10, Steffen Jahn, Neue Mineralien

Other languages

German

Edwardsit

Spanish

Edwardsita

English

Edwardsite

Russian

Эдвардсит

CNMNC (IMA)-Number

IMA 2009-048

CNMNC symbol

Symbol

Edw

Locations with GPS information

IDs

GUSID (Global unique identifier short form) ysJnB8TLIk-006b6A8roTQ
GUID (Global unique identifier) 0767C2CA-CBC4-4F22-B4D3-A6FA03CAE84D
Database ID 5275