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Cualstibite

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Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany
© Brent Thorne

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Formula:
Cu
 
2
Al[(OH)
 
6
|Sb
5+
 
(OH)
 
6
]
System:TrigonalHardness:2
Name:Named for chemical composition (Cu, Al, Sb).


An extremely rare secondary antimony mineral closely related to cyanophyllite and zincalstibite (zinc analogue of cualstibite).

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

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].
Twinning:Twin axis [110].
Comment:Structure solved from twinned crystal.

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

Chemical Properties of Cualstibite

Formula:
Cu
 
2
Al[(OH)
 
6
|Sb
5+
 
(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

Related Minerals - Nickel-Strunz Grouping):

- +
4.FB.05Shakhovite
Hg
 
4
SbO
 
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
 
2
O
 
3
]
 
6
[SbS
 
3
]
 
2
[(H
 
2
O)
 
6-x
(OH)
 
x
] (x = 0.5)
24.1.3Partzite
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

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

Articles/Blogs about Cualstibite

Internet Links for Cualstibite

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    Localities for Cualstibite

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    (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.
    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)
    Italy
     
    • Friuli Venezia Giulia
      • Udine Province
        • Forni Avoltri
    		Ciriotti, M.E., Möckel, S., Blaβ, G., Bortolozzi, G. (2006): Cualstibite: ritrovamenti italiani. MICRO (UK report), 2006, 19-24.
        • Tolmezzo
    		Ciriotti, M.E., Möckel, S., Blaβ, G., Bortolozzi, G. (2006): Cualstibite: ritrovamenti italiani. MICRO (UK report), 2006, 19-24.
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