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Andyrobertsite

A valid IMA mineral species
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08624860014947932044819.jpg
Andyrobertsite

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia
08456420016113841203902.jpg
Andyrobertsite

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia
09389590014949409408701.jpg
Andyrobertsite, etc.

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia
06185390014950257543995.jpg
Andyrobertsite

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia
08456420016113841203902.jpg
Andyrobertsite

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia
09389590014949409408701.jpg
Andyrobertsite, etc.

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia
06830100014949409401948.jpg
Andyrobertsite

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia
08456420016113841203902.jpg
Andyrobertsite

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia
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About AndyrobertsiteHide

04157540015303138315569.jpg
Andrew C. Roberts
Formula:
KCdCu5(AsO4)4(H2AsO4) · 2H2O
Colour:
Electric blue; greenish blue in transmitted light.
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
4.011 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Andrew (Andy) Clifford Roberts (1950-), mineralogist with the Geological Survey of Canada, specialist in documentation of new mineral species, in particular from low-temperature secondary parageneses.
Isostructural with:
Calcioandyrobertsite
The Cd analogue of calcioandyrobertsite.

Structurally related to the Lavendulan Group.


Unique IdentifiersHide

Mindat ID:
6802
Long-form identifier:
mindat:1:1:6802:0
GUID
(UUID V4):
5262135a-8b7f-44fe-87d8-5818444ea81f

Classification of AndyrobertsiteHide

IMA status:
Approved
Approval year:
1997
First published:
1999
Type description reference:
Cooper, Mark A., Hawthorne, Frank C., Pinch, William W., Grice, Joel D. (1999) Andyrobertsite and Calcioandyrobertsite: Two New Minerals from the Tsumeb Mine, Tsumeb, Namibia. The Mineralogical Record, 30 (3) 181-186
Strunz-mindat (2023):
8.DH.50

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
H : With large and medium-sized cations, (OH, etc.):RO4 < 1:1

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
ArbIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of AndyrobertsiteHide

Lustre:
Vitreous
Transparency:
Transparent
Colour:
Electric blue; greenish blue in transmitted light.
Streak:
pale blue
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on (100)
Fracture:
Conchoidal
Density:
4.011 g/cm3 (Calculated)
Comment:
The calculated density for an aggregate crystal of andyrobertsite and calcioandyrobertsite in a 50:50 proportion of the end-members.

Optical Data of AndyrobertsiteHide

Type:
Biaxial (-)
RI values:
nα = 1.720(3) nβ = 1.749(1) nγ = 1.757(1)
2V:
Measured: 50° (5), Calculated: 55°
Max Birefringence:
δ = 0.037
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong
Optical Extinction:
X ∧ a = 12° (in β obtuse); Y = b; Z = c.
Pleochroism:
Non-pleochroic

Chemical Properties of AndyrobertsiteHide

Formula:
KCdCu5(AsO4)4(H2AsO4) · 2H2O
IMA Formula:
KCdCu5(AsO4)4[As(OH)2O2] · 2H2O
Elements listed:
As, Cd, Cu, H, K, O - search for minerals with similar chemistry

Crystallography of AndyrobertsiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 9.8102(9) Å, b = 10.0424(6) Å, c = 9.9788(6) Å
β = 101.686(7)°
Ratio:
a:b:c = 0.977 : 1 : 0.994
Unit Cell V:
962.71 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Platy habit with forms {100} (dominant), {210}, {001}, {102} and {011}.
Twinning:
No twinning observed.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005686AndyrobertsiteCooper M A, Hawthorne F C (2000) Highly undersaturated anions in the crystal structure of andyrobertsite - calcio-andyrobertsite, a doubly acid arsenate of the form K(Cd,Ca)[Cu5(AsO4)4{As(OH)2O2}](H2O)2 The Canadian Mineralogist 38 817-83020000293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.64 Å(100)
3.145 Å(50)
4.46 Å(40)
3.048 Å(40)
2.698 Å(40)
7.00 Å(30)
4.81 Å(30)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47d : [Arsenates, antimonates, selenates, bismuthinates]

Type Occurrence of AndyrobertsiteHide

Type Locality:
ⓘ Tsumeb Mine (Ongopolo Mine), Tsumeb, Oshikoto Region, Namibia
General Appearance of Type Material:
Lamellar intergrowth with calcioandyrobertsite as plates, to 10 mm, that radiate from the center of an aggregate 1.4 cm long and 1 cm at the base.
Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Ontario, Canada (M47022 and M47110).
The Natural Museum of Natural History, Washington, D.C., USA (171487).
Associated Minerals at Type Locality:
Tennantite SubgroupCopper-bearing AdamiteCopper-bearing AdamiteCalcioandyrobertsite
Reference:
Cooper, M.A., Hawthorne, F.C., Pinch, W.W., Grice, J.D. (1999) Andyrobertsite and calcioandyrobertsite, two new minerals from the Tsumeb Mine, Tsumeb, Namibia. The Mineralogical Record: 30: 181-186.
Download:
https://rruff.info/rruff_1.0/uploads/MR30_181.pdf

Synonyms of AndyrobertsiteHide

Other Language Names for AndyrobertsiteHide

Relationship of Andyrobertsite to other SpeciesHide

Structurally related to group(s):
Lavendulan GroupMahnertite, richelsdorfite, andyrobertsite and calcioandyrobertsite are structurally ...

Common AssociatesHide

Associated Minerals Based on Photo Data:
4 photos of Andyrobertsite associated with CalcioandyrobertsiteKCaCu5(AsO4)4(H2AsO4) · 2H2O

Related Minerals - Strunz-mindat GroupingHide

8.DH.FerroberauniteFe2+Fe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DH.Rowleyite[Na(NH4,K)9Cl4][V5+,4+2(P,As)O8]6 · n[H2O,Na,NH4,K,Cl]Iso.
8.DH.Ammoniotinsleyite(NH4)Al2(PO4)2(OH) · 2H2OMon. 2/m : P21/m
8.DH.Thebaite-(NH4)(NH4)3Al(C2O4)(PO3OH)2(H2O)Mon. 2/m : P21/b
8.DH.Dendoraite-(NH4)(NH4)2NaAl(C2O4)(PO3OH)2(H2O)2Mon. 2/m
8.DH.Whiteite-(MnMnMn)Mn2+Mn2+Mn2+2Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.Whiteite-(CaMnFe)CaMnFe2Al2(PO4)4(OH)2 · 8H2OMon. 2/m
8.DH.HochleitneriteMn2Ti3(PO4)4O2(H2O)2 · 14H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.RegeriteKFe6(PO4)4(OH)7(H2O)6 · 4H2OMon. 2/m : P21/b
8.DH.05MinyuliteKAl2(PO4)2F · 4H2OOrth. mm2 : Pba2
8.DH.10LeucophosphiteKFe3+2(PO4)2(OH) · 2H2OMon. 2/m : P21/b
8.DH.10Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2OMon. 2/m
8.DH.10TinsleyiteKAl2(PO4)2(OH) · 2H2OMon.
8.DH.15Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15KeckiteCaMn2+(Fe3+Mn2+)Fe3+2(PO4)4(OH)3 · 7H2OMon. 2/m : P2/b
8.DH.15Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
8.DH.15Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m
8.DH.15Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
8.DH.15Jahnsite-(MnMnMn){Mn2+}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
8.DH.15Kaluginite(Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2OOrth.
8.DH.15Jahnsite-(CaFeFe){Ca}{Fe2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon.
8.DH.15Jahnsite-(NaFeMg)NaFe3+Mg2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(NaMnMg){(Na,Ca)}{(Mn2+,Fe3+)}{(Mg,Fe3+)2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMgMg){Ca}{Mg}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaMnMn){Ca}{Mn2+}{Mn2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Whiteite-(MnMnMg)MnMnMg2Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(MnMnMg)Mn2+Mn2+Mg2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaFeMg)CaFe2+Mg2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(MnMnFe)Mn2+Mn2+Fe2+2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Whiteite-(CaMgMg)CaMg3Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(MnMnZn)Mn2+Mn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(NaMnMn)NaMn2+(Mn2+Fe3+)Σ2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnZn)CaMn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.20Lun'okite(Mn,Ca)(Mg,Fe,Mn)Al(PO4)2OH · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.20Manganosegelerite(Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.20OveriteCaMgAl(PO4)2(OH) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.20SegeleriteCa2 Mg2 Fe3+2(PO4)4(OH)2 · 8H2OOrth. mmm (2/m 2/m 2/m) : Pcca
8.DH.20WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.20JuonniiteCaMgSc(PO4)2(OH) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.25CalcioferriteCa2Fe3+2(PO4)3(OH) · 7H2OMon. 2/m : B2/b
8.DH.25KingsmountiteCa3MnFeAl4(PO4)6(OH)4 · 12H2OTric. 1 : P1
8.DH.25MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2OMon. 2 : B2
8.DH.25ZodaciteCa4Mn2+Fe3+4(PO4)6(OH)4 · 12H2OMon.
8.DH.25FanfaniiteCa4MnAl4(PO4)6(OH)4 · 12H2OMon. 2/m : B2/b
8.DH.30ArseniosideriteCa2Fe3+3(AsO4)3O2 · 3H2OMon. 2/m : B2/b
8.DH.30KolfaniteCa2Fe3+3O2(AsO4)3 · 2H2OMon.
8.DH.30MitridatiteCa2Fe3+3(PO4)3O2 · 3H2OMon. 2/m : B2/b
8.DH.30PararobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. 2/m : P21/b
8.DH.30RobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. m : Bb
8.DH.30Sailaufite(Ca,Na,◻)2Mn3+3(AsO4)2(CO3)O2 · 3H2OMon. m : Bm
8.DH.35MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.35PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.35Benyacarite(H2O)2Mn2Ti2Fe3+(PO4)4(OF)(H2O)10 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.40XanthoxeniteCa4Fe3+2(PO4)4(OH)2 · 3H2OTric. 1 : P1
8.DH.45MahnertiteNaCu3(AsO4)2Cl · 5H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mmm
8.DH.50CalcioandyrobertsiteKCaCu5(AsO4)4(H2AsO4) · 2H2OMon. 2/m : P21/m
8.DH.55EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2OMon. 2/m
8.DH.60BouazzeriteBi6(Mg,Co)11Fe3+14(AsO4)18(OH)4O12 · 86H2OMon. 2/m
8.DH.65GalliskiiteCa4Al2(PO4)2F8 · 5H2OTric. 1 : P1
8.DH.70JoteiteCa2CuAl(AsO4)[AsO3(OH)]2(OH)2 · 5H2OTric. 1 : P1
8.DH.75KampeliteBa6Mg3Sc8(PO4)12(OH)6 · 7H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.DH.80KapundaiteNaCaFe4(PO4)4(OH)3 · 5H2OTric. 1 : P1
8.DH.85VaniniiteCa2Mn2+3Mn3+2O2(AsO4)4 · 2H2OMon. 2/m : P21/b

Fluorescence of AndyrobertsiteHide

In UV light:
Not fluorescent.

Other InformationHide

IR Spectrum:
Broad IR absorption at ~3300 cm-1 and a sharp weaker absorption at 1644 cm-1, indicating the presence of H2O in the structure; a sharp absorption at 3448 cm-1 is compatible with the presence of OH in the structure.
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 AndyrobertsiteHide

References for AndyrobertsiteHide

Reference List:
Cooper, Mark A., Hawthorne, Frank C., Pinch, William W., Grice, Joel D. (1999) Andyrobertsite and Calcioandyrobertsite: Two New Minerals from the Tsumeb Mine, Tsumeb, Namibia. The Mineralogical Record, 30 (3) 181-186
Cooper, M.A., Hawthorne, F.C. (2000) Highly undersaturated anions in the crystal structure of andyrobertsite - calcio-andyrobertsite, a doubly acid arsenate of the form K(Cd,Ca)[Cu 2+ 5(AsO4)4{As(OH)2O2}](H2O)2. The Canadian Mineralogist, 38, 817-830.

Localities for AndyrobertsiteHide

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 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Namibia (TL)
 
  • Oshikoto Region
    • Tsumeb
Cooper, Mark A., Hawthorne, Frank C., Pinch, William W., Grice, Joel D. (1999) Andyrobertsite and Calcioandyrobertsite: Two New Minerals from the Tsumeb Mine, Tsumeb, Namibia. The Mineralogical Record, 30 (3) 181-186
Cooper, M.A. and Hawthorne, F.C. (2000) Highly undersaturated anions in the crystal structure of andyrobertsite - calcio-andyrobertsite, a doubly acid arsenate of the form K(Cd,Ca)[Cu2+5(AsO4)4{As(OH)2O2}](H2O)2. Canadian Mineralogist: 38: 817-830.
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