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Gordaite

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Big Photo

Mansfeld Basin, Saxony-Anhalt, Germany
© Thomas Witzke

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Formula:
NaZn
 
4
(SO
 
4
)(OH)
 
6
Cl · 6H
 
2
O
System:TrigonalLustre:Vitreous
Hardness:2½
Name:Named after the type locality, Sierra Gorda District, Tocopilla Province, Antofagasta Region, Chile.


Compare thérèsemagnanite.

See also the anthropogenic slag phase Unnamed (Gordaite-related Ca-Zn Sulphate Chloride Hydrate).

Classification of Gordaite

IMA status:Approved 1996
Strunz 8th edition ID:3/D.03-25
Nickel-Strunz 10th (pending) edition ID:7.DF.50

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
F : With large and medium-sized cations
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Type Occurrence of Gordaite

Type Locality:San Francisco Mine (Beatrix Mine), Caracoles, Sierra Gorda District, Antofagasta Province, Antofagasta Region, Chile

Physical Properties of Gordaite

Lustre:Vitreous
Hardness (Mohs):2½

Crystallography of Gordaite

Crystal System:Trigonal
Class (H-M):3 - Rhombohedral
Space Group:P3
Cell Parameters:a = 8.413Å, c = 13.095Å
Ratio:a:c = 1 : 1.557
Unit Cell Volume:V 802.67 ų (Calculated from Unit Cell)

Optical Data of Gordaite

Type:Uniaxial (-)
RI values: nω = 1.561 nε = 1.538
Maximum Birefringence:δ = 0.023

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low

Chemical Properties of Gordaite

Formula:
NaZn
 
4
(SO
 
4
)(OH)
 
6
Cl · 6H
 
2
O
Essential elements:Cl, H, Na, O, S, Zn
All elements listed in formula:Cl, H, Na, O, S, Zn

Relationship of Gordaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.DF.05Uklonskovite
NaMg(SO
 
4
)F · 2H
 
2
O
7.DF.10Kainite
KMg(SO
 
4
)Cl · 3H
 
2
O
7.DF.15Natrochalcite
NaCu
 
2
(SO
 
4
)
 
2
(OH) · 2H
 
2
O
7.DF.20Metasideronatrite
Na
 
4
Fe
 
2
(SO
 
4
)
 
4
(OH)
 
2
 · 2H
 
2
O
7.DF.20Sideronatrite
Na
 
2
Fe(SO
 
4
)
 
2
(OH) · 3H
 
2
O
7.DF.25Despujolsite
Ca
 
3
Mn
4+
 
(SO
 
4
)
 
2
(OH)
 
6
 · 3H
 
2
O
7.DF.25Fleischerite
Pb
 
3
Ge(SO
 
4
)
 
2
(OH)
 
6
 · 3H
 
2
O
7.DF.25Schaurteite
Ca
 
3
Ge(SO
 
4
)
 
2
(OH)
 
6
 · 4H
 
2
O
7.DF.25Mallestigite
Pb
 
3
Sb
5+
 
(SO
 
4
)(AsO
 
4
)(OH)
 
6
 · 3H
 
2
O
7.DF.30Slavíkite
(H
 
3
O
+
 
)
 
3
Mg
 
6
Fe
 
15
(SO
 
4
)
 
21
(OH)
 
18
 · 99H
 
2
O
7.DF.35Metavoltine
Na
 
6
K
 
2
FeFe
 
6
(SO
 
4
)
 
12
O
 
2
 · 18H
 
2
O
7.DF.40Lannonite
HCa
 
4
Mg
 
2
Al
 
4
(SO
 
4
)
 
8
F
 
9
 · 32H
 
2
O
7.DF.40Vlodavetsite
AlCa
 
2
(SO
 
4
)
 
2
F
 
2
Cl · 4H
 
2
O
7.DF.45Peretaite
Ca(SbO)
 
4
(SO
 
4
)
 
2
(OH)
 
2
 · 2H
 
2
O
7.DF.55Clairite
(NH
 
4
)
 
2
Fe
 
3
(SO
 
4
)
 
4
(OH)
 
3
 · 3H
 
2
O
7.DF.60Arzrunite
Cu
 
4
Pb
 
2
(SO
 
4
)(OH)
 
4
Cl
 
6
 · 2H
 
2
O (?)
7.DF.65Elyite
Pb
 
4
Cu(SO
 
4
)O
 
2
(OH)
 
4
 · H
 
2
O
7.DF.70Yecoraite
Fe
3+
3
Bi
 
5
(Te
6+
 
O
 
4
)
 
2
(Te
4+
 
O
 
3
)O
 
9
 · 9H
 
2
O
7.DF.75Riomarinaite
Bi(SO
 
4
)(OH) · H
 
2
O
7.DF.80Dukeite
Bi
3+
24
Cr
6+
8
O
 
57
(OH)
 
6
 · 3H
 
2
O
7.DF.85Xocolatlite
Ca
 
2
Mn
4+
2
(Te
6+
 
O
 
6
)
 
2
 · H
 
2
O

Other Names for Gordaite

Synonyms:
IMA1996-006
Other Languages:
German:Gordait
Spanish:Gordaita

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 Gordaite

Reference List:

- +
Schlüter, J., Klaska, K.-H., Friese, K., Adiwidjaja, G. and Gebhard, G. (1997): Gordaite, NaZn4(SO4)(OH)6Cl•6H2O, a new mineral from the San Francisco Mine, Antofagasta, Chile. Neues Jahrbuch für Mineralogie, Monatshefte (1997): 155-162.

Nasdala, L., Witzke, T., Ullrich, B. and Brett, R. (1998): Gordaite [Zn4Na(OH)6(SO4)Cl•6H2O]: second occurrence in the Juan de Fuca Ridge, and new data. American Mineralogist 83, 1111-1116.

Mineralogical Record: 29: 235-236.

Zeitschrift für Kristallographie: 212: 704-707.

Internet Links for Gordaite

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    • Localities for Gordaite

    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.
    Australia
     
    • New South Wales
      • Yancowinna Co.
        • Broken Hill
    		Birch, W.D. (1999) Block 14 Open Cut, Broken Hill.
    Chile
     
    • Antofagasta Region
      • Antofagasta Province
        • Sierra Gorda District
          • Caracoles
    		Neues Jahrb.(1997) 155-162
    Germany
     
    • Saxony-Anhalt
    		Wittern: "Mineralfundorte in Deutschland", 2001
    Greece
     
    • Attikí (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
        • Lavrion District Mines
          • Agios Konstantinos [St Constantine] (Kamariza)
            • Kamariza Mines (Kamareza Mines)
    		Fritz Schreiber collection
              • Hilarion area
    J. Gröbner und U. Kolitsch (2002): Neufunde von Laurion aus den Jahren 2001 und 2002. Aufschluss 53 (5-6), 363-371.
          • Lavrion (Laurion; Laurium)
    		No reference listed
          • Sounion area
            • Sounion Mines
    		J. Gröbner und U. Kolitsch (2002): Neufunde von Laurion aus den Jahren 2001 und 2002. Aufschluss 53 (5-6), 363-371.
    Italy
     
    • Sardinia
      • Cagliari Province
        • Villaputzu
    		Orlandi, P. & Campostrini, I. (2005): Zibaldone. Aggiornamenti di mineralogia italiana 2004. Rivista Mineralogica Italiana, 3/2005, 184-191.
    Pacific Ocean
     
    • East Pacific Rise
    		AmMin 83:1111-1116
    USA
     
    • Arizona
      • Yavapai Co.
    		Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 4.
    Mineral and/or Locality
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