Davidlloydite
A valid IMA mineral species
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About Davidlloydite
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).
Known as a synthetic compound (Nabar & Patkar, 1974).
Unique Identifiers
Mindat ID:
42229
Long-form identifier:
mindat:1:1:42229:9
GUID
(UUID V4):
(UUID V4):
4899ab4d-7f0f-48f7-b8ff-966c90a02bce
IMA Classification of Davidlloydite
Approved
IMA Formula:
Zn3(AsO4)2 · 4H2O
Approval year:
2011
First published:
2012
Approval history:
2011-053
Classification of Davidlloydite
8.CA.
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Dld | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Davidlloydite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Davidlloydite
Vitreous
Transparency:
Transparent
Comment:
to opalescent
Colour:
colorless
Streak:
white
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
{010}
{010}
Parting:
none
Fracture:
Irregular/Uneven, Hackly
Density:
3.661 g/cm3 (Calculated)
Optical Data of Davidlloydite
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.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
weak r < v
Pleochroism:
Non-pleochroic
Chemistry of Davidlloydite
Mindat Formula:
Zn3(AsO4)2 · 4H2O
Contains considerable Cu, influencing the atomic arrangement.
Contains considerable Cu, influencing the atomic arrangement.
Elements listed:
Crystallography of Davidlloydite
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)°
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
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0018665 | Davidlloydite | 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 | 2012 | Tsumeb, Namibia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.526 Å | (71) |
| 5.409 Å | (37) |
| 4.620 Å | (100) |
| 3.635 Å | (30) |
| 3.253 Å | (40) |
| 2.974 Å | (49) |
| 2.810 Å | (37) |
| 2.701 Å | (39) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Davidlloydite
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 Davidlloydite
Relationship of Davidlloydite to other Species
Member of:
Other Members of this group:
| Arsenohopeite | Zn3(AsO4)2 · 4H2O | Orth. mmm (2/m 2/m 2/m) : Pnma |
| Hopeite | ZnZn2(PO4)2 · 4H2O | Orth. mmm (2/m 2/m 2/m) : Pnma |
| Nizamoffite | Mn2+Zn2(PO4)2(H2O)4 | Orth. mmm (2/m 2/m 2/m) : Pbcm |
| Parahopeite | Zn3(PO4)2 · 4H2O | Tric. 1 : P1 |
| Sergeysmirnovite | MgZn2(PO4)2 · 4H2O | Orth. mmm (2/m 2/m 2/m) : Pnma |
| Unnamed (Mg-analogue of Hopeite) | Mg3(PO4)2 · 4H2O |
Common Associates
Associated Minerals Based on Photo Data:
| 1 photo of Davidlloydite associated with Calcioandyrobertsite | KCaCu5(AsO4)4(H2AsO4) · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 8.CA. | Apexite | NaMg(PO4) · 9H2O |
| 8.CA. | Brandãoite | BeAl2(PO4)2(OH)2(H2O)5 |
| 8.CA.05 | Fransoletite | Ca3Be2(PO4)2(PO3OH)2 · 4H2O |
| 8.CA.05 | Parafransoletite | Ca3Be2(PO4)2(PO3OH)2 · 4H2O |
| 8.CA.10 | Ehrleite | Ca4Be3Zn2(PO4)6 · 9H2O |
| 8.CA.15 | Faheyite | Be2Mn2+Fe3+2(PO4)4 · 6H2O |
| 8.CA.20 | Gainesite | Na(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2O |
| 8.CA.20 | Mccrillisite | NaCs(Be,Li)Zr2(PO4)4 · 1-2H2O |
| 8.CA.20 | Selwynite | NaK(Be,Al)Zr2(PO4)4 · 2H2O |
| 8.CA.25 | Pahasapaite | Li8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O |
| 8.CA.30 | Hopeite | ZnZn2(PO4)2 · 4H2O |
| 8.CA.30 | Arsenohopeite | Zn3(AsO4)2 · 4H2O |
| 8.CA.30 | Nizamoffite | Mn2+Zn2(PO4)2(H2O)4 |
| 8.CA.30 | Unnamed (Mg-analogue of Hopeite) | Mg3(PO4)2 · 4H2O |
| 8.CA.35 | Warikahnite | Zn3(AsO4)2 · 2H2O |
| 8.CA.40 | Phosphophyllite | Zn2Fe(PO4)2 · 4H2O |
| 8.CA.42 | Steinmetzite | Zn2Fe3+(PO4)2(OH) · 3H2O |
| 8.CA.45 | Parascholzite | CaZn2(PO4)2 · 2H2O |
| 8.CA.45 | Scholzite | CaZn2(PO4)2 · 2H2O |
| 8.CA.50 | Keyite | Cu2+3Zn4Cd2(AsO4)6 · 2H2O |
| 8.CA.55 | Pushcharovskite | K0.6Cu18[AsO2(OH)2]4[AsO3OH]10(AsO4)(OH)9.6 · 18.6H2O |
| 8.CA.60 | Prosperite | Ca2Zn4(AsO4)4 · H2O |
| 8.CA.65 | Gengenbachite | KFe3+3(PO3OH)4[PO2(OH)2]2 · 6H2O |
| 8.CA.70 | Parahopeite | Zn3(PO4)2 · 4H2O |
| 8.CA.70 | Reaphookhillite | MgZn2(PO4)2 · 4H2O |
| 8.CA.75 | Stergiouite | CaZn2(AsO4)2 · 4H2O |
| 8.CA.80 | Limousinite | BaCa[Be4P4O16] · 6H2O |
| 8.CA.85 | Minjiangite | BaBe2(PO4)2 |
| 8.CA.85 | Wilancookite | (Ba5Li2◻)Ba6Be24P24O96 · 26H2O |
Fluorescence of Davidlloydite
None
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Davidlloydite
mindat.org URL:
https://www.mindat.org/min-42229.html
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Please feel free to link to this page.
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References for Davidlloydite
Reference List:
Nabar, Mahadeo Anant, Patkar, V. S. (1974) Unit cell of Zn3 (AsO4)2.4H2O. Bulletin de Minéralogie, 97 (6) 479-480 doi:10.3406/bulmi.1974.6936
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011, CNMNC Newsletter No. 10. Mineralogical Magazine, 75 (5) 2549-2561 doi:10.1180/minmag.2011.075.5.2549
Hawthorne, Frank C., Cooper, Mark A., Abdu, Yassir A., Ball, Neil A., Back, Malcolm E., Tait, Kim 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 (1) 45-57 doi:10.1180/minmag.2012.076.1.45
Localities for Davidlloydite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Namibia (TL) | |
| Williams et al. (2011) +1 other reference |
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Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia