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Stranskiite

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Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
© Brent Thorne

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Formula:
Zn
 
2
Cu(AsO
 
4
)
 
2
System:TriclinicColour:Cyan-blue
Hardness:4
Name:
Honoring Professor Iwan N. Stranski (1897–1979), German chemist and physicist, Berlin, Germany.
This page provides mineralogical data about Stranskiite.

Classification of Stranskiite

IMA status:Approved
Strunz 8th edition ID:7/A.09-20
Nickel-Strunz 10th (pending) edition ID:8.AB.35

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
B : With medium-sized cations
Dana 7th edition ID:38.3.7.1
Dana 8th edition ID:38.3.7.1

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
3 : (AB)3(XO4)2
Hey's CIM Ref.:20.3.7

20 : Arsenates (also arsenates with phosphate, but without other anions)
3 : Arsenates of Zn, Cd or Hg
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Type Occurrence of Stranskiite

Type Locality:Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
Year of Discovery:1960
Geological Setting of type material:Oxidation zone of dolostone hosted hydrothermal metal deposit.

Physical Properties of Stranskiite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Cyan-blue
Hardness (Mohs):4
Cleavage:Distinct/Good
Good on {010}, indistinct on {100} {001} {101}
Density (measured):5.23 - 5.3 g/cm3
Density (calculated):5.05(5) g/cm3

Crystallography of Stranskiite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 5.07Å, b = 6.66Å, c = 5.26Å
α = 109.85°, β = 112.14°, γ = 86.88°
Ratio:a:b:c = 0.761 : 1 : 0.79
Unit Cell Volume:V 154.19 ų (Calculated from Unit Cell)
Z:1
Morphology:Tabular crystals in radiating aggregates and massive

Optical Data of Stranskiite

Type:Biaxial (-)
RI values: nα = 1.795 nβ = 1.842 nγ = 1.874
2V:Measured: 80° , Calculated: 76°
Maximum Birefringence:δ = 0.079

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r << v

Chemical Properties of Stranskiite

Formula:
Zn
 
2
Cu(AsO
 
4
)
 
2
Idealised Formula:
(Zn,Cu)
 
3
(AsO
 
4
)
 
2
Essential elements:As, Cu, O, Zn
All elements listed in formula:As, Cu, O, Zn

Relationship of Stranskiite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.AB.05Farringtonite
Mg
 
3
(PO
 
4
)
 
2
8.AB.10Ferrisicklerite
(Fe
3+
 
,LiMn
2+
 
)PO
 
4
8.AB.10Heterosite
(Fe
3+
 
,Mn
3+
 
)PO
 
4
8.AB.10Lithiophilite
LiMn
2+
 
PO
 
4
8.AB.10Natrophilite
NaMn
2+
 
PO
 
4
8.AB.10Purpurite
(Mn
3+
 
,Fe
3+
 
)PO
 
4
8.AB.10Sicklerite
(LiMn
2+
 
,Fe
3+
 
)PO
 
4
8.AB.10Simferite
Li(Mg,Fe
3+
 
,Mn
3+
 
)
 
2
(PO
 
4
)
 
2
8.AB.10Triphylite
LiFe
2+
 
PO
 
4
8.AB.15Sarcopside
(Fe
2+
 
,Mn
2+
 
,Mg)
 
3
(PO
 
4
)
 
2
8.AB.15Chopinite
(Mg,Fe
2+
 
)
 
3
(PO
 
4
)
 
2
8.AB.20Beusite
(Mn
2+
 
,Fe
2+
 
,Ca,Mg)
 
3
(PO
 
4
)
 
2
8.AB.20Graftonite
(Fe
2+
 
,Mn
2+
 
,Ca)
 
3
(PO
 
4
)
 
2
8.AB.25Xanthiosite
Ni
 
3
(AsO
 
4
)
 
2
8.AB.30Lammerite
Cu
 
3
(AsO
 
4
)
 
2
8.AB.30IMA2009-002
Cu
 
3
(AsO
 
4
)
 
2
8.AB.35Mcbirneyite
Cu
 
3
(VO
 
4
)
 
2
8.AB.40Lyonsite
Cu
 
3
Fe
 
4
(VO
 
4
)
 
6
Related Minerals - Hey's Index Grouping:

- +
20.3.1Adamite
Zn
 
2
(AsO
 
4
)(OH)
20.3.2Paradamite
Zn
 
2
(AsO
 
4
)(OH)
20.3.3Koritnigite
Zn(HAsO
 
4
) · H
 
2
O
20.3.4Legrandite
Zn
 
2
(AsO
 
4
)(OH) · H
 
2
O
20.3.5Warikahnite
Zn
 
3
(AsO
 
4
)
 
2
 · 2H
 
2
O
20.3.6Köttigite
Zn
 
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.3.8Philipsburgite
(Cu,Zn)
 
6
(AsO
 
4
,PO
 
4
)
 
2
(OH)
 
6
 · H
 
2
O
20.3.9Austinite
CaZn(AsO
 
4
)(OH)
20.3.10Prosperite
CaZn
 
2
(AsO
 
4
)(HAsO
 
4
)(OH)
20.3.11Gaitite
Ca
 
2
Zn(AsO
 
4
)
 
2
 · 2H
 
2
O
20.3.12Zincroselite
Ca
 
2
Zn(AsO
 
4
)
 
2
 · 2H
 
2
O
20.3.13O'Danielite
Na(Zn,Mg)
 
3
H
 
2
(AsO
 
4
)
 
3
20.3.14Johillerite
Na(Mg,Zn)
 
3
Cu(AsO
 
4
)
 
3
20.3.15Holdenite
(Mn
2+
 
,Mg)
 
6
Zn
 
3
(AsO
 
4
)
 
2
(SiO
 
4
)(OH)
 
8
20.3.16Chudobaite
(Mg,Zn)
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 10H
 
2
O
20.3.17Chlorophoenicite
(Mn,Mg)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
20.3.18Lotharmeyerite
Ca(Zn,Mn
3+
 
)
 
2
(AsO
 
4
)
 
2
 · 2(H
 
2
O,OH)
20.3.19Metaköttigite
(Zn,Fe,Fe)
 
3
(AsO
 
4
)
 
2
 · 8(H
 
2
O,OH)
20.3.20Ojuelaite
ZnFe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
 · 4H
 
2
O
20.3.21Fahleite
Zn
 
5
CaFe
 
2
(AsO
 
4
)
 
6
 · 14H
 
2
O
20.3.22Keyite
Cu
2+
3
Zn
 
4
Cd
 
2
(AsO
 
4
)
 
6
 · 2H
 
2
O

Other Names for Stranskiite

Other Languages:
German:Stranskiit
Russian:Странскиит
Spanish:Stranskiita

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 Stranskiite

Reference List:

- +
Strunz, H. (1960) Stranskiit, ein neues Mineral. Naturwiss., 47, 376 (in German).

American Mineralogist (1960): 45: 1315 (abstract).

Hänni, H.A., W.B. Stern, and M. Glor (1978) New data on stranskiite from Tsumeb, Namibia. American Mineralogist (1978): 63: 213-215.

Keller, P., H. Hess, and P.J. Dunn (1979) Die Ladungsbilanz für eine verfeinerte Kristallstruktur von Stranskiit, Zn2Cu(AsO4)2. Tschermaks Mineralogische und Petrographische Mitteilungen: 26(3): 167-174.

Zeitschrift für Kristallographie: 124: 91-100.

Zeitschrift für Kristallographie: 130: 231-233.

Internet Links for Stranskiite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Stranskiite details from Handbook of Mineralogy (PDF)
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    • Localities for Stranskiite

    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.
    Hide Locality List
    (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.
    Austria
     
    • Tyrol
      • North Tyrol
        • Inn valley
          • Brixlegg - Schwaz area
            • Brixlegg - Rattenberg
    		Schnorrer, G. & Poeverlein, R. (2005): Schwaz-Brixlegger-Fundstellen: 3. Die Minerale vom Bergbau Maukenötz bei Brixlegg, Tirol. Der Aufschluss, 56, 223-234.
    Germany
     
    • North Rhine-Westphalia
      • Sauerland
        • Iserlohn
          • Letmathe
    		Wittern: "Mineralfundorte in Deutschland", 2001
    • Rhineland-Palatinate
      • Lahn valley
    		Wittern: "Mineralfundorte in Deutschland", 2001
          • Frücht
    		Der Aufschluss Vol.55, March/April 2004
    Namibia
     
    • Otjikoto (Oshikoto) Region
      • Tsumeb
    		Naturwissenschaften,(1960) 47, 376; J.W. Anthony, R.A. Bideaux, K.W. Bladh, M.C. Nichols: Handbook of Mineralogy, Vol. IV (2000)
    Tajikistan
     
    • Viloyati Sogd (Viloyati Sughd; Viloyati Khodzhent; Viloyati Leninabad)
      • Zeravshan Range
        • Yagnob River
    		Van King
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