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Arsenohopeite

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Formula:
Zn3(AsO4)2 · 4H2O
Colour:
colourless, blue
Lustre:
Vitreous
Hardness:
3
Crystal System:
Orthorhombic
Member of:
Name:
For arsenate being the dominant anion and its relationship to hopeite.
Isostructural with:
The arsenate analogue of hopeite.


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Classification of ArsenohopeiteHide

Approved
Approval Year:
2010
8.CA.30

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
40.3.4.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O

Pronounciation of ArsenohopeiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of ArsenohopeiteHide

Vitreous
Transparency:
Translucent
Colour:
colourless, blue
Streak:
white
Hardness:
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Distinct/Good
Perfect on {010}, good on {100} and poor on {001}.

Optical Data of ArsenohopeiteHide

Type:
Biaxial (-)
RI values:
nα = 1.598(2) nβ = 1.606(2) nγ = 1.613(2)
2V:
Calculated: 86°
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of ArsenohopeiteHide

Formula:
Zn3(AsO4)2 · 4H2O

Crystallography of ArsenohopeiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 10.804(2) Å, b = 19.003(4) Å, c = 5.112(1) Å
Ratio:
a:b:c = 0.569 : 1 : 0.269
Unit Cell V:
1,049.54 ų (Calculated from Unit Cell)
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.502 (100)
5.196 (31)
4.937 (50)
4.490 (28)
4.110 (48)
3.978 (28)
3.567 (31)
2.926 (95)

Type Occurrence of ArsenohopeiteHide

General Appearance of Type Material:
A single crystal aggregate.
Place of Conservation of Type Material:
Natural History Museum, Vienna (Austria), catalogue no. N8167.

Synonyms of ArsenohopeiteHide

Relationship of Arsenohopeite to other SpeciesHide

Member of:
Other Members of this group:
DavidlloyditeZn3(AsO4)2·4H2O Tric. 1 : P1
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

Related Minerals - Nickel-Strunz GroupingHide

8.CA.DavidlloyditeZn3(AsO4)2·4H2O Tric. 1 : P1
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.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

Related Minerals - Dana Grouping (8th Ed.)Hide

40.3.4.1HopeiteZn3(PO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma

Fluorescence of ArsenohopeiteHide

None observed.

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 ArsenohopeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Neuhold, F., Kolitsch, U., Bernhardt, H.-J., and Lengauer, C.L. (2011): Arsenohopeite, IMA 2010-069. CNMNC Newsletter 8, 291; Mineralogical Magazine 75, 289-294.
F. Neuhold, U. Kolitsch, H.-J. Bernhardt, C. L. Lengauer (2012): Arsenohopeite, a new zinc arsenate mineral from the Tsumeb mine, Namibia. Mineral. Mag. 76, 603-612.

Internet Links for ArsenohopeiteHide

Localities for ArsenohopeiteHide

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 (Otjikoto Region)
    • Tsumeb
Neuhold, F., Kolitsch, U., Bernhardt, H.-J., and Lengauer, C.L. (2011) CNMNC Newsletter 8, 291; F. Neuhold, U. Kolitsch, H.-J. Bernhardt, C. L. Lengauer (2012) Arsenohopeite, a new zinc arsenate mineral from the Tsumeb mine, Namibia. Mineralogical Magazine 76, 603-612; Bezing, L. von., Bode, R., and Jahn, S., (2016) Namibia Minerals and Localities II. Edition Krüger-Stiftung, Bode Verlag GmbH, Salzhemmendorf, Germany, 37 pg (in English)
Mineral and/or Locality  
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