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Zýkaite

Big Photo

Reiche Zeche Mine, Himmelfahrt Mine, Freiberg, Freiberg District, Erzgebirge, Saxony, Germany
© Thomas Witzke

Show Zýkaite Photos (5)
Formula:
Fe
3+
4
[OH|SO
 
4
|(AsO
 
4
)
 
3
] · 15H
 
2
O
System:OrthorhombicColour:Greyish-white, light ...
Hardness:2
Name:Named after V. Zyka


Sanjuanite-Destinezite Group

Classification of Zýkaite

IMA status:Approved 1976
Strunz 8th edition ID:7/D.05-60
Nickel-Strunz 10th (pending) edition ID:8.DB.45

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
B : With only medium-sized cations, (OH, etc.):RO4< 1:1
Dana 8th edition ID:43.5.3.2

43 : COMPOUND PHOSPHATES, ETC.
5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen
Hey's CIM Ref.:22.3.28

22 : Phosphates, Arsenates or Vanadates with other Anions
3 : Phosphates, arsenates or vanadates with sulphates
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Type Occurrence of Zýkaite

Type Locality:Safary mine, Kaňk, Kutná Hora (Kuttenberg), Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic
Year of Discovery:1978

Physical Properties of Zýkaite

Lustre:Dull
Colour:Greyish-white, light yellow, light green
Streak:White
Hardness (Mohs):2

Crystallography of Zýkaite

Crystal System:Orthorhombic
Cell Parameters:a = 20.85Å, b = 7.03Å, c = 36.99Å
Ratio:a:b:c = 2.966 : 1 : 5.262
Unit Cell Volume:V 5,421.83 ų (Calculated from Unit Cell)

Optical Data of Zýkaite

Type:Biaxial (-)
RI values: nα = 1.632 nβ = 1.635 - 1.636 nγ = 1.646
2V:Measured: 60° , Calculated: 56° to 66°
Maximum Birefringence:δ = 0.014

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

Chemical Properties of Zýkaite

Formula:
Fe
3+
4
[OH|SO
 
4
|(AsO
 
4
)
 
3
] · 15H
 
2
O
Essential elements:As, Fe, H, O, S
All elements listed in formula:As, Fe, H, O, S

Relationship of Zýkaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.DB.05Diadochite
Fe
3+
2
(PO
 
4
)(SO
 
4
)(OH)·5H
 
2
O
8.DB.05Pitticite
[Fe, SO
 
4
, AsO
 
4
, H
 
2
O] ?
8.DB.05Destinezite
Fe
3+
2
[OH|SO
 
4
|PO
 
4
]·6H
 
2
O
8.DB.10Vashegyite
Al
 
11
[(OH)
 
6
|(PO
 
4
)
 
9
] · 38H
 
2
O
8.DB.15Schoonerite
ZnMn
2+
 
Fe
2+
2
Fe
3+
 
(PO
 
4
)
 
3
(OH)
 
2
 · 9H
 
2
O
8.DB.20Sinkankasite
H
 
2
Mn
2+
 
Al[OH|(PO
 
4
)
 
2
] · 6H
 
2
O
8.DB.25Mitryaevaite
Al
 
6
(PO
 
4
)[(P,S)O
 
3
(OH,O)]
 
2
F
 
2
(OH)
 
2
(H
 
2
O)
 
8
· 6.5H
 
2
O
8.DB.30Sanjuanite
Al
 
2
[OH|SO
 
4
|PO
 
4
] · 9H
 
2
O
8.DB.35Sarmientite
Fe
3+
2
[OH|SO
 
4
|AsO
 
4
] · 5H
 
2
O
8.DB.40Bukovskýite
Fe
3+
2
[OH|SO
 
4
|AsO
 
4
] · 7H
 
2
O
8.DB.50Giniite
Fe
2+
 
Fe
3+
4
[(OH)
 
5
|(PO
 
4
)
 
3
] · 2H
 
2
O
8.DB.55Sasaite
(Al,Fe
3+
 
)
 
14
[(OH)
 
7
|SO
 
4
|(PO
 
4
)
 
11
] · 83H
 
2
O
8.DB.60Mcauslanite
HFe
2+
3
Al
 
2
[F|(PO
 
4
)
 
4
] · 18H
 
2
O
8.DB.65Goldquarryite
CuCd
 
2
Al
 
3
(PO
 
4
)
 
4
F
 
2
(H
 
2
O)
 
10
(H
 
2
O,F)
 
2
8.DB.70Birchite
Cd
 
2
Cu
 
2
(PO
 
4
)
 
2
(SO
 
4
)·5H
 
2
O
8.DB.75Braithwaiteite
NaCu
 
5
(TiSb)
 
2
O
 
2
(AsO
 
4
)[AsO
 
3
(OH)]
 
2
 ·8H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
22.3.1Parnauite
Cu
 
9
[(OH)
 
10
|SO
 
4
|(AsO
 
4
)
 
2
] · 7H
 
2
O
22.3.2Ardealite
Ca
 
2
[HPO
 
4
|SO
 
4
] · 4H
 
2
O
22.3.3Machatschkiite
(Ca,Na)
 
6
AsO
 
4
(AsO
 
3
OH)
 
3
(PO
 
4
,SO
 
4
)·15H
 
2
O
22.3.4Clinotyrolite
Ca
 
2
Cu
 
9
[(OH,O)
 
10
|(AsO
 
4
,SO
 
4
)
 
4
] · 10H
 
2
O
22.3.5Peisleyite
Na
 
3
Al
 
16
[SO
 
4
|(PO
 
4
)
 
5
]
 
2
 · 20H
 
2
O
22.3.6Chalcophyllite
Cu
 
18
Al
 
2
[(OH)
 
9
|SO
 
4
|AsO
 
4
]
 
3
 · 33H
 
2
O
22.3.7Woodhouseite
CaAl
 
3
[(OH)
 
6
|SO
 
4
|PO
 
4
]
22.3.8Schlossmacherite
(H
 
3
O,Ca)Al
 
3
[(OH)
 
6
|(SO
 
4
,AsO
 
4
)
 
2
]
22.3.9Svanbergite
SrAl
 
3
[(OH)
 
6
|SO
 
4
|PO
 
4
]
22.3.10Kemmlitzite
(Sr,Ce)Al
 
3
[(OH)
 
6
|SO
 
4
|AsO
 
4
]
22.3.11Sanjuanite
Al
 
2
[OH|SO
 
4
|PO
 
4
] · 9H
 
2
O
22.3.12Kribergite
Al
 
5
[(OH)
 
4
|SO
 
4
|(PO
 
4
)
 
3
] · 4H
 
2
O
22.3.13Hotsonite
Al
 
11
[(OH)
 
21
|(SO
 
4
)
 
3
|(PO
 
4
)
 
2
] · 16H
 
2
O
22.3.14Weilerite
22.3.15Tsumebite
Pb
 
2
Cu[OH|SO
 
4
|PO
 
4
]
22.3.16Arsentsumebite
Pb
 
2
Cu[OH|SO
 
4
|AsO
 
4
]
22.3.17Hinsdalite
PbAl
 
3
[(OH)
 
6
|SO
 
4
|PO
 
4
]
22.3.18Hidalgoite
PbAl
 
3
[(OH)
 
6
|SO
 
4
|AsO
 
4
]
22.3.19Orpheite
PbAl
 
3
[(OH)
 
6
|(PO
 
4
,SO
 
4
)
 
2
] (?)
22.3.20Coconinoite
Fe
3+
2
Al
 
2
(UO
 
2
)
 
2
[(OH)
 
2
|SO
 
4
|(PO
 
4
)
 
4
] · 20H
 
2
O
22.3.21Sasaite
(Al,Fe
3+
 
)
 
14
[(OH)
 
7
|SO
 
4
|(PO
 
4
)
 
11
] · 83H
 
2
O
22.3.22Tristramite
(Ca,U,Fe)(PO
 
4
,SO
 
4
)·2H
 
2
O
22.3.23Corkite
PbFe
 
3
[(OH)
 
6
|SO
 
4
|PO
 
4
]
22.3.24Beudantite
PbFe
 
3
[(OH)
 
6
|SO
 
4
|AsO
 
4
]
22.3.25Diadochite
Fe
3+
2
(PO
 
4
)(SO
 
4
)(OH)·5H
 
2
O
22.3.26Sarmientite
Fe
3+
2
[OH|SO
 
4
|AsO
 
4
] · 5H
 
2
O
22.3.27Bukovskýite
Fe
3+
2
[OH|SO
 
4
|AsO
 
4
] · 7H
 
2
O
22.3.29Tooeleite
Fe
3+
6
(AsO
 
3
)
 
4
(SO
 
4
)(OH)
 
4
· 4H
 
2
O
22.3.30Pitticite
[Fe, SO
 
4
, AsO
 
4
, H
 
2
O] ?
22.3.31Xiangjiangite
(Fe
3+
 
,Al)(UO
 
2
)
 
4
[OH|(SO
 
4
)
 
2
|(PO
 
4
)
 
2
] · 22H
 
2
O

Other Names for Zýkaite

Synonyms:
IMA1976-039
Other Languages:
German:Zykait
Spanish:Zykaita

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 Zýkaite

Reference List:Neues Jahrbuch für Mineralogie, Monatshefte (1978): 134-144.

American Mineralogist (1978: 63: 1284.

Internet Links for Zýkaite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Zýkaite in the Natural History Museum (London) online catalogue
  • Zykaite details from Handbook of Mineralogy (PDF)
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    Localities for Zýkaite

    (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.
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Central Bohemia Region
        • Kutná Hora (Kuttenberg)
          • Kaňk
    		American Mineralogist (1978) 63: 1284.
      • Karlovy Vary Region
        • Krušné Hory Mts (Erzgebirge)
          • Ostrov
    		Lapis 2002(7/8), 63-65
    Germany
     
    • Saxony
      • Erzgebirge
        • Freiberg District
          • Brand-Erbisdorf
            • Vereinigt Feld Mine
    		T. Witzke & M. Hocker (1993): Neue Vorkommen von Bukovskyit, Zykait und Kankit.- Lapis 18(6), 49-50
          • Freiberg
            • Himmelfahrt Mine
    		Thomas Witzke collection
          • Großvoigtsberg
    		T. Witzke & M. Hocker (1993): Neue Vorkommen von Bukovskyit, Zykait und Kankit.- Lapis 18(6), 49-50
      • Meißen
    		http://www.mineralienatlas.de/lexikon/index.php/Deutschland/Sachsen/Mei%DFen/Munzig
    Poland
     
    • Lower Silesia (Dolnośląskie)
      • Kaczawskie Mts
        • Radzimowice
          • Stara Góra
    		4. R. Siuda, 2004a : Iron arsenates from the Stara Góra deposit at Radzimowice in Kaczawskie Mountains, Poland- a preliminary report, Mineralogical Society of Poland, Special Papers, vol 24, 345-348
    Mineral and/or Locality
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