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Calcioandyrobertsite

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Formula:
KCaCu5(AsO4)4(H2AsO4) · 2H2O
System:
Monoclinic
Lustre:
Vitreous
Hardness:
3
Name:
Named after Andrew C. Roberts (1950-), mineralogist with the Geological Survey of Canada.
Isostructural with:
The Ca analogue of andyrobertsite.

1M and 2O polytypes are known, and they were originally approved separately as IMA1997-022 and IMA2000-011, respectively. Type locality for both is Tsumeb.
Data given below are for the 1M polytype; the 2O polytype is orthorhombic mmm, space group Pnma, a = 19.647 Å, b = 10.087 Å, c = 9.903 Å, Z = 4.

Structurally related to the Lavendulan Group.

Classification of Calcioandyrobertsite

Approved 1997
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
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Type Occurrence of Calcioandyrobertsite

Physical Properties of Calcioandyrobertsite

Vitreous
Hardness (Mohs):
3
Tenacity:
Brittle
Cleavage:
Distinct/Good
(100)

Crystallography of Calcioandyrobertsite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 9.81Å, b = 10.034Å, c = 9.975Å
α = 90°, β = 101.84°, γ = 90°
Ratio:
a:b:c = 0.978 : 1 : 0.994
Unit Cell Volume:
V 960.98 ų
Z:
2
Morphology:
platy, veinlets
Comment:
1M polytype (O polytype is orthorhombic, space group Pnma, a = 19.647 Å, b = 10.087 Å, c = 9.903 Å)

Optical Data of Calcioandyrobertsite

Type:
Biaxial (-)
RI values:
nα = 1.713 nβ = 1.743 nγ = 1.749
Max Birefringence:
δ = 0.036
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
weak

Chemical Properties of Calcioandyrobertsite

Formula:
KCaCu5(AsO4)4(H2AsO4) · 2H2O
Essential elements:
All elements listed in formula:

Relationship of Calcioandyrobertsite to other Species

Structurally related to group(s):
8.DH.05MinyuliteKAl2(PO4)2(OH,F) · 4H2O
8.DH.10LeucophosphiteKFe23+(PO4)2(OH) · 2H2O
8.DH.10Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2O
8.DH.10TinsleyiteKAl2(PO4)2(OH) · 2H2O
8.DH.15Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15KeckiteCaMn2+Fe23+Fe23+(PO4)4(OH)3(H2O)7
8.DH.15Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(MnMnMn){Mn2+}{Mn2+}{Mn22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Kaluginite(Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2O
8.DH.15Jahnsite-(CaFeFe){Ca}{Fe2+}{Fe22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(NaFeMg)NaFe3+Mg2Fe23+(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(NaMnMg){Na}{Mn3+}{Mg2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMgMg){Ca}{Mg}{Mg2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.20Manganosegelerite(Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2O
8.DH.20OveriteCaMgAl(PO4)2(OH) · 4H2O
8.DH.20SegeleriteCa2 Mg2 Fe23+(PO4)4(OH)2 · 8H2O
8.DH.20WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2O
8.DH.20JuonniiteCaMgSc(PO4)2(OH) · 4H2O
8.DH.25CalcioferriteCa2Fe23+(PO4)3(OH) · 7H2O
8.DH.25KingsmountiteCa4(Fe2+,Mn2+)Al4(PO4)6(OH)4 · 12H2O
8.DH.25MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
8.DH.25ZodaciteCa4Mn2+Fe43+(PO4)6(OH)4 · 12H2O
8.DH.30ArseniosideriteCa2Fe33+(AsO4)3O2 · 3H2O
8.DH.30KolfaniteCa2Fe33+O2(AsO4)3 · 2H2O
8.DH.30MitridatiteCa2Fe33+(PO4)3O2 · 3H2O
8.DH.30PararobertsiteCa2Mn33+(PO4)3O2 · 3H2O
8.DH.30RobertsiteCa3Mn43+(PO4)3O2 · 3H2O
8.DH.30Sailaufite(Ca,Na,☐)2Mn33+(AsO4)2(CO3)O2 · 3H2O
8.DH.35MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2O
8.DH.35PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2O
8.DH.35Benyacarite(H2O,K)2(Mn2+,Fe2+)2(Fe3+,Ti)2Ti(PO4)4(O,F)2 · 14H2O
8.DH.40XanthoxeniteCa4Fe23+(PO4)4(OH)2 · 3H2O
8.DH.45MahnertiteNaCu3(AsO4)2Cl · 5H2O
8.DH.50AndyrobertsiteKCdCu5(AsO4)4(H2AsO4) · 2H2O
8.DH.55EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2O
8.DH.60BouazzeriteBi6(Mg,Co)11Fe143+(AsO4)18(OH)4O12 · 86H2O

Other Names for Calcioandyrobertsite

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.

References for Calcioandyrobertsite

Reference List:
Cooper, M.A., Hawthorne, F.C., Pinch, W.W., and Grice, J.D. (1999) Andyrobertsite and calcioandyrobertsite, two new minerals from the Tsumeb Mine, Tsumeb, Namibia. Mineralogical Record: 30: 181-186.

Sarp, H. and Černý, R. (2004): Calcio-andyrobertsite-2O, KCaCu5(AsO4)4[AsO2(OH)2]·2H2O: its description, crystal structure and relation with calcio-andyrobertsite-1M. European Journal of Mineralogy: 16: 163-169.

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)[Cu 2+ 5(AsO4)4{As(OH)2O2}](H2O)2. Canadian Mineralogist: 38: 817-830.


Internet Links for Calcioandyrobertsite

Localities for Calcioandyrobertsite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
U. Kolitsch, J. Gröbner, F. Brandstätter and R. Bayerl (2010): Neufunde aus der Grube Clara im mittleren Schwarzwald (IV): Calcioandyrobertsit, Cotunnit, Gerhardtit, Khaidarkanit, Lukrahnit, Mckinstryit, Moolooit, Rhabdophan-(La), Rouait und Uricit. Lapis 35 (9), 22-27; 62 (in German).
Namibia
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Cooper, M.A., Hawthorne, F.C., Pinch, W.W., and Grice, J.D. (1999) Andyrobertsite and calcioandyrobertsite, two new minerals from the Tsumeb Mine, Tsumeb, Namibia. Mineralogical Record: 30: 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.
Switzerland
 
  • Wallis (Valais)
    • Anniviers Valley
      • Saint-Luc
Ansermet, S. (2012): Mines et minéraux du Valais - II. Anniviers et Tourtemagne. With contributions by N. Meisser, Ed. Porte-plumes (Ayer)
    • Turtmann Valley
      • Blüomatttälli
Ansermet, S. (2012): Mines et minéraux du Valais - II. Anniviers et Tourtemagne. With contributions by N. Meisser, Ed. Porte-plumes (Ayer)
Mineral and/or Locality  
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