Zykaite Mineral Data

Zykaite Mineral Data +

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General Zykaite Information

Chemical Formula:

Fe+++4(AsO4)3(SO4)(OH)·15(H2O)

Composition:

Molecular Weight = 1,023.45 gm

Iron 21.83 % Fe 31.21 % Fe₂O₃

Arsenic 21.96 % As 33.69 % As₂O₅

Hydrogen 3.05 % H 27.28 % H₂O

Sulfur 3.13 % S 7.82 % SO₃

Oxygen 50.03 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺₄(AsO₄)₃(SO₄)(OH)·15(H₂O)

IMA Status:

Approved IMA 1978

Locality:

Kank, near Kutna Hora, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named for Vaclav Zyka (1926-), Czech geochemist.

Zykaite Image

Images:

Zykaite Bukovskyite

Comments: Pale beige acicular crystals of bukovsk?ite with white zykaite.
Location: Christbescherung Mine, Gro?voigtsberg, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Zykaite

Comments: Round aggregates of Zykaite.
Location: Reiche Zeche Mine, Freiberg, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Specimen size 37 mm.
© Thomas Witzke / Abraxas-Verlag

Zykaite Crystallography

Axial Ratios:

a:b:c =2.965:1:5.2596

Cell Dimensions:

a = 20.853, b = 7.033, c = 36.991, Z = 8; V = 5,425.07 Den(Calc)= 2.51

Crystal System:

OrthorhombicSpace Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 10.4(1), 10.6(0.7), 6.92(0.4),

Physical Properties of Zykaite

Color:

Greenish white, Gray white.

Density:

2.5

Diaphaniety:

Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Hardness:

2 - Gypsum

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Zykaite

Gladstone-Dale:

CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2541,KPDmeas= 0.2551,KC= 0.2595

Optical Data:

Biaxial (-), a=1.632, b=1.635-1.636, g=1.646, bire=0.0140, 2V(Calc)=56-66, 2V(Meas)=60.

Calculated Properties of Zykaite

Electron Density:

r_electron=2.47 gm/cc
note: r_Zykaite=2.50 gm/cc.

Fermion Index

Fermion Index = 0.0051
Boson Index = 0.9949

Photoelectric:

PE_Zykaite= 21.10 barns/electron
U=PE_Zykaite x r_electron= 52.16 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Zykaite is Not Radioactive

Zykaite Classification

Dana Class:

43.5.3.2 (43)Compound Phosphates, etc.

(43.5)(Hydrated Compound Anions With Hydroxyl or Halogen)

(43.5.3)Dana Group

43.5.3.1 Pitticite Hydrousferricarsenatesulfate(Fe,AsO4,SO4,H2O) None

43.5.3.2 Zykaite Fe4(AsO4)3(SO4)(OH)·15(H2O) Unk Ortho

Strunz Class:

VII/D.05-60 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.05 - Pitticite - Zykaite series

VII/D.05-10 Pitticite Hydrousferricarsenatesulfate(Fe,AsO4,SO4,H2O) None

VII/D.05-20 Diadochite Fe2(PO4)(SO4)(OH)·6(H2O) P1 1

VII/D.05-30 Sarmientite Fe2(AsO4)(SO4)(OH)·5(H2O) P 2₁/c 2/m

VII/D.05-40 Bukovskyite Fe2(AsO4)(SO4)(OH)·7(H2O) P1 or P1 Tri

VII/D.05-50 Tooeleite Fe(8-2x)[(As(1-x),S(x))O4]6·5(H2O) Pbcm,Pbc21 Ortho

VII/D.05-60 Zykaite Fe4(AsO4)3(SO4)(OH)·15(H2O) Unk Ortho

Other Zykaite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Zykaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Zykaite

Fe+++4(AsO4)3(SO4)(OH)·15(H2O)
Dana No: 43.5.3.2 Strunz No: VII/D.05-60
Locality:

Notes: