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Zýkaite

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About ZýkaiteHide

Václav Zýka
Formula:
Fe3+4(AsO4)3(SO4)(OH) · 15H2O
Colour:
Greyish white, light yellow, light green
Lustre:
Dull
Hardness:
2
Crystal System:
Orthorhombic
Name:
Named after Dr. Václav Zýka (1926 – 1990), Director, Institute of Raw Materials, Kutná Hora, Czech Republic.

Classification of ZýkaiteHide

Approved
Approval Year:
1976
First Published:
1978
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

Physical Properties of ZýkaiteHide

Colour:
Greyish white, light yellow, light green
Streak:
White
Hardness:

Optical Data of ZýkaiteHide

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 ZýkaiteHide

Formula:
Fe3+4(AsO4)3(SO4)(OH) · 15H2O

Crystallography of ZýkaiteHide

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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.6 (7)
10.4 (10)
6.92 (4)
5.610 (4)
3.812 (4)
3.516 (3)
2.831 (4)

Type Occurrence of ZýkaiteHide

Place of Conservation of Type Material:
Charles University, Prague, Czech Republic, 20558.
National School of Mines, Paris, France.
National Museum of Natural History, Washington, D.C., USA, 144940, 144941.
Reference:
Cech, F., Praha, J., Novak, F. (1978) Zýkaite, Fe43+ (AsO4)3(SO4)(OH)·15H2O, a new mineral. Neues Jahrbuch für Mineralogie, Monatshefte: 1978: 134-144.

Synonyms of ZýkaiteHide

Other Language Names for ZýkaiteHide

German:Zykait
Spanish:Zykaita

Relationship of Zýkaite to other SpeciesHide

Other Members of this group:
DestineziteFe3+2(PO4)(SO4)(OH) · 6H2OTric. 1 : P1
SanjuaniteAl2(PO4)(SO4)(OH) · 9H2O
SarmientiteFe3+2(AsO4)(SO4)(OH) · 5H2OMon. 2/m : P21/b

Common AssociatesHide

Associated Minerals Based on Photo Data:
Kaňkite4 photos of Zýkaite associated with Kaňkite on mindat.org.
Bukovskýite1 photo of Zýkaite associated with Bukovskýite on mindat.org.
Arsenopyrite1 photo of Zýkaite associated with Arsenopyrite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.DB.05DiadochiteFe3+2(PO4)(SO4)(OH) · 5H2OAmor.
8.DB.05Pitticite(Fe, SO4, AsO4, H2O) ?Amor.
8.DB.05DestineziteFe3+2(PO4)(SO4)(OH) · 6H2OTric. 1 : P1
8.DB.10VashegyiteAl11(PO4)9(OH)6 · 38H2OOrth. mmm (2/m 2/m 2/m)
8.DB.15SchooneriteZnMn2+Fe2+2Fe3+(PO4)3(OH)2 · 9H2OOrth. mmm (2/m 2/m 2/m) : Pbam
8.DB.20SinkankasiteMn2+Al(PO3OH)2(OH) · 6H2OTric.
8.DB.25MitryaevaiteAl6(PO4)((P,S)O3(OH,O))2F2(OH)2 · 14.5H2OTric.
8.DB.30SanjuaniteAl2(PO4)(SO4)(OH) · 9H2O
8.DB.35SarmientiteFe3+2(AsO4)(SO4)(OH) · 5H2OMon. 2/m : P21/b
8.DB.40BukovskýiteFe3+2(AsO4)(SO4)(OH) · 9H2OTric. 1 : P1
8.DB.50GiniiteFe2+Fe3+4(PO4)3(OH)5 · 2H2OMon. 2/m : P2/b
8.DB.55Sasaite(Al,Fe3+)14(PO4)11(SO4)(OH)7 · 83H2OOrth.
8.DB.60McauslaniteFe3Al2(PO4)3(PO3OH)F · 18H2OTric.
8.DB.65GoldquarryiteCuCd2Al3(PO4)4F2(H2O,F)2 · 10H2OTric. 1 : P1
8.DB.70BirchiteCd2Cu2(PO4)2(SO4) · 5H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.DB.75BraithwaiteiteNaCu5(Ti4+Sb5+)(AsO4)4(HAsO4)2O2 · 8H2OTric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

43.5.3.1Pitticite(Fe, SO4, AsO4, H2O) ?Amor.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.3.1ParnauiteCu9(AsO4)2(SO4)(OH)10 · 7H2OOrth. mm2 : Pmn21
22.3.2ArdealiteCa2(HPO4)(SO4) · 4H2OMon. m : Bb
22.3.3Machatschkiite(Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2OHex.
22.3.4ClinotyroliteCa2Cu9(AsO4,SO4)4(OH,O)10 · 10H2OMon.
22.3.5PeisleyiteNa2Al9[(P,S)O4]8(OH)6•28H2OTric. 1 : P1
22.3.6ChalcophylliteCu18Al2(AsO4)4(SO4)3(OH)24 · 36H2OTrig. 3 : R3
22.3.7WoodhouseiteCaAl3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.8Schlossmacherite(H3O)Al3(SO4)2(OH)6Trig.
22.3.9SvanbergiteSrAl3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.10KemmlitziteSrAl3(AsO4)(SO4)(OH)6Trig.
22.3.11SanjuaniteAl2(PO4)(SO4)(OH) · 9H2O
22.3.12KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
22.3.13HotsoniteAl11(SO4)3(PO4)2(OH)21 · 16H2OTric.
22.3.14WeileriteBaAl3(AsO4)(SO4)(OH)6
22.3.15TsumebitePb2Cu(PO4)(SO4)(OH)Mon. 2/m : P21/m
22.3.16ArsentsumebitePb2Cu(AsO4)(SO4)(OH)Mon. 2/m : P21/m
22.3.17HinsdalitePbAl3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.18HidalgoitePbAl3(AsO4)(SO4)(OH)6Trig.
22.3.19OrpheitePbAl3(PO4)(SO4)(OH)6Trig.
22.3.20CoconinoiteFe3+2Al2(UO2)2(PO4)4(SO4)(OH)2 · 20H2OMon.
22.3.21Sasaite(Al,Fe3+)14(PO4)11(SO4)(OH)7 · 83H2OOrth.
22.3.22Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2OHex.
22.3.23CorkitePbFe3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.24BeudantitePbFe3(AsO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.25DiadochiteFe3+2(PO4)(SO4)(OH) · 5H2OAmor.
22.3.26SarmientiteFe3+2(AsO4)(SO4)(OH) · 5H2OMon. 2/m : P21/b
22.3.27BukovskýiteFe3+2(AsO4)(SO4)(OH) · 9H2OTric. 1 : P1
22.3.29TooeleiteFe3+6(As3+O3)4(SO4)(OH)4 · 4H2OMon. 2/m : B2/m
22.3.30Pitticite(Fe, SO4, AsO4, H2O) ?Amor.
22.3.31Xiangjiangite(Fe3+,Al)(UO2)4(PO4)2(SO4)2(OH) · 22H2OTet.

Other InformationHide

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 ZýkaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cech, F., Praha, J., Novak, F. (1978) Zýkaite, Fe43+ (AsO4)3(SO4)(OH)·15H2O, a new mineral. Neues Jahrbuch für Mineralogie, Monatshefte: 1978: 134-144.
Fleischer, M. (1978) New mineral names. American Mineralogist: 63: 1282-1284. [http://rruff.info/rruff_1.0/uploads/AM63_1282.pdf]
Majzlan, J., Amoako, F.Y., Kindlova, H., Drahota, P. (2015) Thermodynamic properties of zýkaite, a ferric sulfoarsenate. Applied Geochemistry: 61: 294-301.

Internet Links for ZýkaiteHide

Localities for ZýkaiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Czech Republic (TL)
 
  • 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
    • Meißen
http://www.mineralienatlas.de/lexikon/index.php/Deutschland/Sachsen/Mei%DFen/Munzig
    • Mittelsachsen
      • Freiberg
        • Brand-Erbisdorf
          • Vereinigt Feld Mine
T. Witzke & M. Hocker (1993): Neue Vorkommen von Bukovskyit, Zykait und Kankit.- Lapis 18(6), 49-50
        • Großvoigtsberg
T. Witzke & M. Hocker (1993): Neue Vorkommen von Bukovskyit, Zykait und Kankit.- Lapis 18(6), 49-50
        • Himmelfahrt Mine
Thomas Witzke collection
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium; Lavreotiki Municipality)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
          • Kamariza Mines (Kamareza Mines)
            • Hilarion area
Rieck, B., Kolitsch, U., Voudouris, P., Giester, G. and Tzeferis, P. (2018): Weitere Neufunde aus Lavrion, Griechenland. Mineralien-Welt 29 (5), 32-77 (in German).
Poland
 
  • Lower Silesia
    • 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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