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Davidlloydite

Collectors Summary

Color farblos
Lustre Glasglanz
Hardness (Mohs) 3 - 4
Cleavages {010} deutlich
Crystal System triklin, P1

Chemism

Chem­ical formula

Zn3(AsO4)2·4H2O

Addi­tional chem. informa­tion

As-Analog von Parahopeit

Chem­ical com­po­si­tion

Arsen, Zink, Sauerstoff, Wasserstoff

Unit weight: 546.12814 u; Number of atoms in the formula: 25

Info

Empirical formula:

Zn3(AsO4)2·4H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.48

8

32.00

1.0079470

8.0635760

Oxygen

O

35.16

12

48.00

15.9994300

191.9931600

Zinc

Zn

35.93

3

12.00

65.4094000

196.2282000

Arsenic

As

27.44

2

8.00

74.9216020

149.8432040

Anal­y­sis wt%

As2O5 : 43.03, ZnO : 37.95, CuO : 5.65, H2O : 13.27 (Ref: Mineralogical Magazine 2012)

Strunz 9th edi­tion incl. updates

8.CA.30

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

Lapis Clas­sifica­tion

VII/C.11-035

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.CB.275

8: PHOSPHATES ARSENATES VANADATES
C: Phosphates (-Anions +Water)
B: Valency: 2, C medium, Me3~[XO4]2*nH2O
2: nH2O=4 Hopeite-Group

IMA sta­tus

anerkannt - CNMNC - New minerals and nomenclature modifications approved in Aug. 2011

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Hopeite group

Optical Properties

Color

farblos

Lus­tre

Glasglanz

max. Birefrin­gence

0.024

Birefringence chart\! Davidlloydite title=Birefringence chart Davidlloydite

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

1.671

RI value β

1.687

RI value γ / ε

1.695

Ri mean

1.684

2V angle

Biaxial (+) 65°

Crystallography

Crystal Sys­tem

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell param­e­ters a (Å)

5.976

Cell param­e­ters b (Å)

7.600

Cell param­e­ters c (Å)

5.447

Cell param­e­ters a/b or c/a

0.786

Cell param­e­ters c/b

0.717

Cell param­e­ters α

84.28

Cell param­e­ters β

90.50

Cell param­e­ters γ

88.0

Z

1

Volumne (ų)

245.989

X-Ray Pow­der Diffrac­tion

7.526(71), 5.409(37), 4.620(100), 3.635(30), 3.253(40), 2.974(49), 2.810(37), 2.701(39)

XRD chart Davidlloydite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

3 - 4

Density (g/cm³)

3.661

3.686 ( ρ calc. Mineralienatlas )

Cleav­ages

{010} deutlich

(Co-)Type locality

(Co-)Type locality

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

Type mate­r­ial

Department of Natural History, Royal Ontario Museum, Toronto, Ontario, Canada

Col­lec­tion number of type mate­r­ial

M56120

Preface

Occurrences

Cu-Zn Lagerstätten

Author (Name, Year)

Mark A. Cooper, Neil Ball, Yassir Abdu, Malcolm Back, Kim Tait and Frank C. Hawthorne (2011)

References

Cooper, M.A., Ball, N., Abdu, Y., Back, M., Tait, K. and Hawthorne, F.C. (2011) Davidlloydite, IMA 2011-053. CNMNC Newsletter No. 10, October 2011, page 2561;

IMA group assignments

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Arsenohopeite

Zn3(AsO4)2·4H2O

orthorhombisch : mmm : Pnma

8.CA.30

Davidlloydite

Zn3(AsO4)2·4H2O

triklin : 1 : P1

8.CA.30

Hopeite

Zn3(PO4)2·4H2O

orthorhombisch : mmm : Pnma

8.CA.30

Parahopeite

Zn3(PO4)2·4H2O

triklin : 1 : P1

8.CA.30

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Phosphophyllite

Zn2(Fe2+,Mn)(PO4)2·4H2O

monoklin : 2/m : P21/c

VII/C.11-010

Hopeite

Zn3(PO4)2·4H2O

orthorhombisch : mmm : Pnma

VII/C.11-020

Arsenohopeite

Zn3(AsO4)2·4H2O

orthorhombisch : mmm : Pnma

VII/C.11-025

Parahopeite

Zn3(PO4)2·4H2O

triklin : 1 : P1

VII/C.11-030

Davidlloydite

Zn3(AsO4)2·4H2O

triklin : 1 : P1

VII/C.11-035

Radovanite

Cu2Fe3+[AsO2(OH)2|(AsO4)2]·H2O

orthorhombisch : mmm : Pnma

VII/C.11-040

Smolyaninovite

Co3Fe3+2(AsO4)4·11H2O

VII/C.11-050

Fahleite

CaZn5Fe3+2(AsO4)6·14H2O

VII/C.11-060

Barahonaite-(Al)

(Ca,Cu,Na,Fe3+,Al)12Al2(AsO4)8(OH,Cl)x·nH2O

monoklin : 2/m oder m : P2/a oder Pa

VII/C.11-070

Barahonaite-(Fe)

(Ca,Cu,Na,Fe3+,Al )12Fe3+2(AsO4)8(OH,Cl)x·nH2O

monoklin : 2/m oder m : P2/a oder Pa

VII/C.11-080

Currierite

Na4Ca3MgAl4(AsO3OH)12·9H2O

hexagonal : 622 : P622

VII/C.11-090

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Hopeite

Zn3(PO4)2·4H2O

orthorhombisch : mmm : Pnma

8.CB.200

Arsenohopeite

Zn3(AsO4)2·4H2O

orthorhombisch : mmm : Pnma

8.CB.205

Rollandite

Cu3[AsO4]2 ·4H2O

orthorhombisch : mmm : Pnma

8.CB.210

Phosphophyllite

Zn2(Fe2+,Mn)(PO4)2·4H2O

monoklin : 2/m : P21/c

8.CB.230

Ludlamite

(Fe2+,Mg,Mn)3(PO4)2·4H2O

monoklin : 2/m : P21/a

8.CB.235

Metaswitzerite

Mn3(PO4)2·4H2O

monoklin : 2/m : P21/c

8.CB.240

Parahopeite

Zn3(PO4)2·4H2O

triklin : 1 : P1

8.CB.270

Davidlloydite

Zn3(AsO4)2·4H2O

triklin : 1 : P1

8.CB.275

Other languages

German

Davidlloydit

English

Davidlloydite

Russian

Дэвидллойдит

IMA Number

IMA 2011-053

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

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