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Davidlloydite

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About DavidlloyditeHide

David and Audrey Lloyd
Formula:
Zn3(AsO4)2·4H2O
Contains considerable Cu, influencing the atomic arrangement.
Colour:
colorless
Lustre:
Vitreous
Hardness:
3 - 4
Specific Gravity:
3.661 (Calculated)
Crystal System:
Triclinic
Member of:
Name:
Named by F.C. Hawthorne, M.A. Cooper, Y.A. Abdu, N.A. Ball, M.E. Back, and K.T. Tait in 2011 in honor of David Lloyd (born 24 March 1943 in Bristol, England), a prominent mineral collector who was a prime mover in the re-opening of the Tsumeb mine for mineral collecting, and who has made significant contributions to mineralogy through extensive field collecting at many localities in the British Isles.
The As analogue of parahopeite, but not strictly isotypic with it.
Known as a synthetic compound (Nabar & Patkar, 1974).


Classification of DavidlloyditeHide

Approved
Approval Year:
2011
First Published:
2012
Approval History:
2011-053
8.CA.

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations

Pronounciation of DavidlloyditeHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of DavidlloyditeHide

Vitreous
Transparency:
Transparent
Comment:
to opalescent
Colour:
colorless
Streak:
white
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
{010}
Parting:
none
Fracture:
Irregular/Uneven, Hackly
Density:
3.661 g/cm3 (Calculated)

Optical Data of DavidlloyditeHide

Type:
Biaxial
RI values:
nα = 1.671(2) nβ = 1.687(2) nγ = 1.695(2)
2V:
Measured: 65.4° (6), Calculated: 70°
Max Birefringence:
δ = 0.024
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
weak r < v
Pleochroism:
Non-pleochroic

Chemical Properties of DavidlloyditeHide

Formula:
Zn3(AsO4)2·4H2O

Contains considerable Cu, influencing the atomic arrangement.
IMA Formula:
Zn3(AsO4)2 · 4H2O

Crystallography of DavidlloyditeHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.9756(4) Å, b = 7.6002(5) Å, c = 5.4471(4) Å
α = 84.2892(9)°, β = 90.4920(9)°, γ = 87.9958(9)°
Ratio:
a:b:c = 0.786 : 1 : 0.717
Unit Cell V:
245.99 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Type material occurs as elongated prisms (~10:1 length-to-width ratio) that are flattened on {010}.
Twinning:
None observed

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.526 (71)
5.409 (37)
4.620 (100)
3.635 (30)
3.253 (40)
2.974 (49)
2.810 (37)
2.701 (39)

Type Occurrence of DavidlloyditeHide

General Appearance of Type Material:
subparallel to slightly diverging elongated prisms lying partly on and partly embedded in fine-grained calcioandyrobertsite.
Place of Conservation of Type Material:
Department of Natural History, Royal Ontario Museum, catalogue number M56120.
Geological Setting of Type Material:
Third oxidation zone, Tsumeb mine
Associated Minerals at Type Locality:

Synonyms of DavidlloyditeHide

Relationship of Davidlloydite to other SpeciesHide

Member of:
Other Members of this group:
ArsenohopeiteZn3(AsO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
HopeiteZn3(PO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
NizamoffiteMn2+Zn2(PO4)2(H2O)4Orth. mmm (2/m 2/m 2/m) : Pbcm
ParahopeiteZn3(PO4)2 · 4H2OTric. 1 : P1
Unnamed (Mg-analogue of Hopeite)Mg3(PO4)2 · 4H2O

Common AssociatesHide

Associated Minerals Based on Photo Data:
Calcioandyrobertsite1 photo of Davidlloydite associated with Calcioandyrobertsite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.CA.ApexiteNaMg(PO4)·9H2OTric. 1 : P1
8.CA.05FransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2OMon.
8.CA.05ParafransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2OTric. 1 : P1
8.CA.10EhrleiteCa4Be3Zn2(PO4)6 · 9H2OTric. 1 : P1
8.CA.15FaheyiteBe2Mn2+Fe3+2(PO4)4 · 6H2OTrig. 3 2 : P31 2 1
8.CA.20GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2OTet. 4mm : I41md
8.CA.20MccrillisiteNaCs(Be,Li)Zr2(PO4)4 · 1-2H2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.CA.20SelwyniteNaK(Be,Al)Zr2(PO4)4 · 2H2OTet.
8.CA.25PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2OIso. 2 3 : I2 3
8.CA.30HopeiteZn3(PO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CA.30ArsenohopeiteZn3(AsO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CA.35WarikahniteZn3(AsO4)2 · 2H2OTric.
8.CA.40PhosphophylliteZn2Fe(PO4)2 · 4H2OMon. 2/m : P21/b
8.CA.45ParascholziteCaZn2(PO4)2 · 2H2OMon.
8.CA.45ScholziteCaZn2(PO4)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbcm
8.CA.50KeyiteCu2+3Zn4Cd2(AsO4)6 · 2H2OMon. 2/m
8.CA.55PushcharovskiteK0.6Cu18(AsO4)(HAsO4)10(H2AsO4)4(OH)9.6·18.6H2OTric.
8.CA.60ProsperiteCa2Zn4(AsO4)4 · H2OMon.
8.CA.65GengenbachiteKFe3+3(HPO4)4(H2PO4)2 · 6H2OTrig. 3m : P3 1c
8.CA.70ParahopeiteZn3(PO4)2 · 4H2OTric. 1 : P1

Fluorescence of DavidlloyditeHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for DavidlloyditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nabar, M.A., Patkar, V.S. (1974) Unit cell of trizinc diorthoarsenate tetrahydrate. Bulletin de la Société française de Minéralogie et de Cristallographie: 97: 479-480.
Williams, P.A., Hatert, F., Pasero, M., Mills, S.J. (2011) IMA Commission on new minerals, nomenclature and classification (CNMNC) Newsletter 10. New minerals and nomenclature modifications approved in 2011. Mineralogical Magazine: 75: 2549-2561.
Hawthorne, F.C., Cooper, M.A., Abdu, Y.A., Ball, N.A., Back, M.E., Tait, K.T. (2012) Davidlloydite, ideally Zn3(AsO4)2(H2O)4, a new arsenate mineral from the Tsumeb mine, Otjikoto (Oshikoto) region, Namibia: description and crystal structure. Mineralogical Magazine: 76: 45-57.
Belakovskiy, D., Welch, M.D., Cámara, F., Diego Gatta, G., Tait, K.T. (2012) New mineral names. American Mineralogist: 97: 1523-1530.

Internet Links for DavidlloyditeHide

Localities for DavidlloyditeHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Namibia (TL)
 
  • Oshikoto Region
    • Tsumeb
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.
Mineral and/or Locality  
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