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Zýkaite

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Formula:
Fe43+(AsO4)3(SO4)(OH) · 15H2O
System:
Orthorhombic
Colour:
Greyish white, light ...
Hardness:
2
Name:
Named after Dr. Václav Zýka (1926 – ), Director, Institute of Raw Materials, Kutná Hora, Czech Republic.

Classification of Zýkaite

Approved 1976
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
43.5.3.2

43 : COMPOUND PHOSPHATES, ETC.
5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen
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

Year of Discovery:
1976

Physical Properties of Zýkaite

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°
Max Birefringence:
δ = 0.014
Image 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:
Fe43+(AsO4)3(SO4)(OH) · 15H2O
Essential elements:
All elements listed in formula:

Relationship of Zýkaite to other Species

Other Members of Group:
DestineziteFe23+(PO4)(SO4)(OH) · 6H2O
SanjuaniteAl2(PO4)(SO4)(OH) · 9H2O
SarmientiteFe23+(AsO4)(SO4)(OH) · 5H2O
8.DB.05DiadochiteFe23+(PO4)(SO4)(OH) · 5H2O
8.DB.05Pitticite(Fe, SO4, AsO4, H2O) ?
8.DB.05DestineziteFe23+(PO4)(SO4)(OH) · 6H2O
8.DB.10VashegyiteAl11(PO4)9(OH)6 · 38H2O
8.DB.15SchooneriteZnMn2+Fe22+Fe3+(PO4)3(OH)2 · 9H2O
8.DB.20SinkankasiteMn2+Al(PO3OH)2(OH) · 6H2O
8.DB.25MitryaevaiteAl6(PO4)((P,S)O3(OH,O))2F2(OH)2 · 14.5H2O
8.DB.30SanjuaniteAl2(PO4)(SO4)(OH) · 9H2O
8.DB.35SarmientiteFe23+(AsO4)(SO4)(OH) · 5H2O
8.DB.40BukovskýiteFe23+(AsO4)(SO4)(OH) · 9H2O
8.DB.50GiniiteFe2+Fe43+(PO4)3(OH)5 · 2H2O
8.DB.55Sasaite(Al,Fe3+)14(PO4)11(SO4)(OH)7 · 83H2O
8.DB.60McauslaniteFe3Al2(PO4)3(PO3OH)F · 18H2O
8.DB.65GoldquarryiteCuCd2Al3(PO4)4F2(H2O,F)2 · 10H2O
8.DB.70BirchiteCd2Cu2(PO4)2(SO4) · 5H2O
8.DB.75BraithwaiteiteNaCu5(Ti4+Sb5+)(AsO4)4(HAsO4)2O2 · 8H2O
22.3.1ParnauiteCu9(AsO4)2(SO4)(OH)10 · 7H2O
22.3.2ArdealiteCa2(HPO4)(SO4) · 4H2O
22.3.3Machatschkiite(Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2O
22.3.4ClinotyroliteCa2Cu9(AsO4,SO4)4(OH,O)10 · 10H2O
22.3.5PeisleyiteNa3Al16(PO4)10(SO4)2(OH)17•20H2O
22.3.6ChalcophylliteCu18Al2(SO4)3(AsO4)3(OH)27 · 33H2O
22.3.7WoodhouseiteCaAl3(PO4)(SO4)(OH)6
22.3.8Schlossmacherite(H3O)Al3(SO4)2(OH)6
22.3.9SvanbergiteSrAl3(PO4)(SO4)(OH)6
22.3.10KemmlitziteSrAl3(AsO4)(SO4)(OH)6
22.3.11SanjuaniteAl2(PO4)(SO4)(OH) · 9H2O
22.3.12KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2O
22.3.13HotsoniteAl11(SO4)3(PO4)2(OH)21 · 16H2O
22.3.14WeileriteBaAl3(AsO4)(SO4)(OH)6
22.3.15TsumebitePb2Cu(PO4)(SO4)(OH)
22.3.16ArsentsumebitePb2Cu(AsO4)(SO4)(OH)
22.3.17HinsdalitePbAl3(PO4)(SO4)(OH)6
22.3.18HidalgoitePbAl3(AsO4)(SO4)(OH)6
22.3.19Orpheite
22.3.20CoconinoiteFe23+Al2(UO2)2(PO4)4(SO4)(OH)2 · 20H2O
22.3.21Sasaite(Al,Fe3+)14(PO4)11(SO4)(OH)7 · 83H2O
22.3.22Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2O
22.3.23CorkitePbFe3(PO4)(SO4)(OH)6
22.3.24BeudantitePbFe3(AsO4)(SO4)(OH)6
22.3.25DiadochiteFe23+(PO4)(SO4)(OH) · 5H2O
22.3.26SarmientiteFe23+(AsO4)(SO4)(OH) · 5H2O
22.3.27BukovskýiteFe23+(AsO4)(SO4)(OH) · 9H2O
22.3.29TooeleiteFe63+(As3+O3)4(SO4)(OH)4 · 4H2O
22.3.30Pitticite(Fe, SO4, AsO4, H2O) ?
22.3.31Xiangjiangite(Fe3+,Al)(UO2)4(PO4)2(SO4)2(OH) · 22H2O

Other Names for Zýkaite

Name in Other Languages:
German:Zykait
Spanish:Zykaita

Other Information

Health Risks:
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

Localities for Zýkaite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (TL)
 
  • Bohemia (Böhmen; Boehmen)
    • Central Bohemia Region
      • Kutná Hora (Kuttenberg)
        • Kaňk
American Mineralogist (1978) 63: 1284.
    • Karlovy Vary Region
      • Krušné Hory Mts (Erzgebirge)
        • Jáchymov District (St Joachimsthal)
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
          • Stara Góra deposit
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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