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Cualstibite

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Formula:
Cu
 
2
Al(OH)
 
6
[Sb
5+
 
(OH)
 
6
]
System:TrigonalHardness:2
Member of:Cualstibite Group > Hydrotalcite Supergroup
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

IMA status:Approved
Strunz 8th edition ID:4/F.12-20
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:44.3.10.1

44 : ANTIMONATES
3 : Miscellaneous
Hey's CIM Ref.:24.1.4

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

Type Locality:Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany
Year of Discovery:1984

Physical Properties of Cualstibite

Lustre:Vitreous
Hardness (Mohs):2

Crystallography of Cualstibite

Crystal System:Trigonal
Class (H-M):3 - Rhombohedral
Space Group:P3
Cell Parameters:a = 9.15(2) Å, c = 9.745(2) Å
Ratio:a:c = 1 : 1.065
Unit Cell Volume:V 706.6 ų
Z:3
Morphology:Short prismatic along [001] (data for 1T polytype).
Twinning:Twin axis [110].
Comment:Data for 1T polytype. Structure solved from twinned crystal.
X-Ray Powder Diffraction:
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
Maximum Birefringence:δ = 0.028

Chart 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:
Cu
 
2
Al(OH)
 
6
[Sb
5+
 
(OH)
 
6
]
Simplified for copy/paste:Cu2Al(OH)6[Sb5+(OH)6]
Essential elements:Al, Cu, H, O, Sb
All elements listed in formula:Al, Cu, H, O, Sb

Relationship of Cualstibite to other Species

Member of:Cualstibite Group > Hydrotalcite Supergroup
Other Members of Group:

- +
Omsite
Ni
 
2
Fe
3+
 
(OH)
 
6
[Sb(OH)
 
6
]
Zincalstibite
Zn
 
2
Al(OH)
 
6
[Sb
5+
 
(OH)
 
6
]
Related Minerals - Nickel-Strunz Grouping):

- +
4.FB.Omsite
Ni
 
2
Fe
3+
 
(OH)
 
6
[Sb(OH)
 
6
]
4.FB.05Shakhovite
(Hg
+
2
)Hg
2+
2
(Sb
3+
 
O
 
3
)(OH)
 
3
4.FB.10Zincalstibite
Zn
 
2
Al(OH)
 
6
[Sb
5+
 
(OH)
 
6
]
Related Minerals - Hey's Index Grouping:

- +
24.1.1Mopungite
Na[Sb
5+
 
(OH)
 
6
]
24.1.2Cetineite
(K,Na)
 
6
Sb
3+
12
(Sb
3+
 
S
 
3
)
 
2
O
 
18
(OH)
 
0.5
· 5,5H
 
2
O
24.1.3Cuproroméite
Cu
 
2
Sb
 
2
(O,OH)
 
7
24.1.5Stetefeldtite
Ag
 
2
Sb
 
2
(O,OH)
 
7

Other Names for Cualstibite

Synonyms:
IMA1983-068
Other Languages:
German:Cualstibit
Spanish:Cualstibita

Polytypes for Cualstibite

Polytypes:
Cualstibite-1MCualstibite-1T

Other Information

Health Warning: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

Search Engines:
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  • External Links:
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  • Look for Cualstibite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Cualstibite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Localities for Cualstibite

    The 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. ? 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
     
    • 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)
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