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Cualstibite

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Formula:
Cu2Al(OH)6[Sb5+(OH)6]
System:
Trigonal
Hardness:
2
Name:
Named for chemical composition (Cu, Al, Sb).
An extremely rare secondary antimony mineral closely related to zincalstibite (zinc analogue of cualstibite).
Two polytypes are known, cualstibite-1T (trigonal) and cualstibite-1M (monoclinic, formerly called cyanophyllite).

Cualstibite Group, Hydrotalcite Supergroup.

Classification of Cualstibite

Approved
4.FB.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
B : Hydroxides with OH, without H2O; insular octahedra
44.3.10.1

44 : ANTIMONATES
3 : Miscellaneous
24.1.4

24 : Antimonates and Antimonites
1 : Antimonates and antimonites of Na, Cu or Ag
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Type Occurrence of Cualstibite

Year of Discovery:
1984

Physical Properties of Cualstibite

Vitreous
Hardness (Mohs):
2

Crystallography of Cualstibite

Polytype:
Formula:
Crystal System:
Class (H-M)
Space Group:
Space Group Setting:
Cell Parameters:
Ratio:
Unit Cell Volume (calc):
Z:
Cualstibite-1MCualstibite-1T
(Cu,Al)3(OH)6[Sb5+(OH)6] 
Monoclinic  
2/m - Prismatic
P21/b  
P21/c  
a = 9.938(1) Å, b = 8.890(1) Å, c = 5.493(1) Å
β = 102.90(1)°

a:b:c = 1.118 : 1 : 0.618 
V 473.05 ų 
2 
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.89 (10)
4.17 (8)
2.65 (7)
2.33 (9)
1.793 (8)
Comments:
Data for 1T polytype.

Optical Data of Cualstibite

Type:
Uniaxial (-)
RI values:
nω = 1.672 nε = 1.644
Max Birefringence:
δ = 0.028
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Comments:
Data for 1T polytype.

Chemical Properties of Cualstibite

Formula:
Cu2Al(OH)6[Sb5+(OH)6]
Essential elements:
All elements listed in formula:

Relationship of Cualstibite to other Species

Other Members of Group:
OmsiteNi2Fe3+(OH)6[Sb(OH)6]
ZincalstibiteZn2Al(OH)6[Sb5+(OH)6]
4.FB.OmsiteNi2Fe3+(OH)6[Sb(OH)6]
4.FB.05Shakhovite(Hg2+)Hg22+(Sb3+O3)(OH)3
4.FB.10ZincalstibiteZn2Al(OH)6[Sb5+(OH)6]
24.1.1MopungiteNa[Sb5+(OH)6]
24.1.2Cetineite(K,Na)6Sb123+(Sb3+S3)2O18(OH)0.5 · 5,5H2O
24.1.3CuproroméiteCu2Sb2(O,OH)7
24.1.5StetefeldtiteAg2Sb2(O,OH)7

Other Names for Cualstibite

Name in Other Languages:
German:Cualstibit
Spanish:Cualstibita

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 Cualstibite

Reference List:
Walenta, K. (1984): Cualstibit, ein neues Sekundärmineral aus der Grube Clara im mittleren Schwarzwald (BRD). Chem. Erde 43, 255-260. (in German).

American Mineralogist: 70: 1329.

Bonaccorsi, E., Merlino, S. and Orlandi, P. (2007): Zincalstibite, a new mineral, and cualstibite: Crystal chemical and structural relationships. American Mineralogist 92, 198-203

Mills, S.J., Christy, A.G., Génin, J.-M.R., Kameda, T. and Colombo, F. (2012): Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76, 1289-1336.

Kolitsch, U., Giester, G. & Pippinger, T. (2013): The crystal structure of cualstibite-1M (formerly cyanophyllite), its revised chemical formula and its relation to cualstibite-1T. Mineral. Petrol. 107, 171-178.

Internet Links for Cualstibite

Localities for Cualstibite

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.
France
 
  • Languedoc-Roussillon
    • Aude
      • Padern
[Cualstibite-1M] Favreau G., Berbain C., Meisser N. (2003), Cyanophyllite et autres espèces rares de la mine du Tistoulet, Padern (Aude), Le Cahier des Micromonteurs, n°4, pp: 17-23
  • Lorraine
    • Vosges
      • Val-d'Ajol
[Cualstibite-1M] Lheur C., Moreau F. (1994), Les minéralisations du filon du Bas Hérival près du Val d'Ajol (Vosges), Le Cahier des Micromonteurs, n°2, pp: 3-14
Germany (TL)
 
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
Chemie der Erde,(1984) 43, 255-260; Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German)
  • North Rhine-Westphalia
    • Sauerland
      • Iserlohn
        • Letmathe
[Cualstibite-1M] SCHNORRER-KÖHLER, G. (1986): Neue Minerale von der Schlackenhalde der ehemaligen Zinkhütte Genna in Letmathe/Sauerland. Aufschluss 37, 55-67.
  • Rhineland-Palatinate
    • Siegerland
      • Niederfischbach
[Cualstibite-1M] Schnorrer-Köhler, G. (1989): Die Minerale der Grube Fischbacher Werk bei Niederfischbach im Bergamtsbezirk Betzdorf/Siegerland. Aufschluss, 40, 75-94 ; Weiss: "Mineralfundstellen, Deutschland West", 1990
Italy
 
  • Friuli-Venezia Giulia
    • Udine Province
      • Degano Valley
Ciriotti, M.E., Möckel, S., Blaβ, G., Bortolozzi, G. (2006): Cualstibite: ritrovamenti italiani. MICRO (UK report), 2006, 19-24.
      • Forni Avoltri
Ciriotti, M.E., Möckel, S., Blaβ, G., Bortolozzi, G. (2006): Cualstibite: ritrovamenti italiani. MICRO (UK report), 2006, 19-24.
Slovakia
 
  • Banská Bystrica Region
    • Banská Bystrica Co.
      • Špania Dolina (Herrengrund)
Martin Števko (unpublished, PXRD and EMPA-WDS confirmed)
South Africa
 
  • Northern Cape Province
    • Namakwa District (Namaqualand)
[Cualstibite-1M] Cairncross, B. (2004): History of The Okiep Copper District, Namaqualand, Northern Cape Province, South Africa. Mineralogical Record 35(4) 289-317.
Switzerland
 
  • Wallis (Valais)
    • Anniviers Valley
      • Saint-Luc
[Cualstibite-1M] Ansermet, S. (2012): Mines et minéraux du Valais - II. Anniviers et Tourtemagne. With contributions by N. Meisser, Ed. Porte-plumes (Ayer); - Ansermet, S. (2012): Mines et minéraux du Valais - II. Anniviers et Tourtemagne. With contributions by N. Meisser, Ed. Porte-plumes (Ayer); Ansermet, S. with contributions of Meisser, N. (2012): Mines et minéraux du Valais. II. Anniviers et Tourtemagne. Musée de la Nature (Sion), Musée Cantonal de Géologie (Lausanne), and Editions Porte-Plumes (Ayer), 374 pp.
Rick Turner (confirmed by XRD and EDX)
Mineral and/or Locality  
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