Zincovoltaite Mineral Data

Zincovoltaite Mineral Data +

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General Zincovoltaite Information

Chemical Formula:

K2Zn5Fe+++3Al(SO4)12·18(H2O)

Composition:

Molecular Weight = 2,076.71 gm

Potassium 3.77 % K 4.54 % K₂O

Aluminum 1.30 % Al 2.45 % Al₂O₃

Zinc 15.74 % Zn 19.60 % ZnO

Iron 8.07 % Fe 11.53 % Fe₂O₃

Hydrogen 1.75 % H 15.61 % H₂O

Sulfur 18.53 % S 46.26 % SO₃

Oxygen 50.85 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂Zn₅Fe³⁺₃Al(SO₄)₁₂·18(H₂O)

IMA Status:

Approved IMA 1987

Locality:

Link to MinDat.org Location Data.

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Zincovoltaite Crystallography

Cell Dimensions:

a = 27.18, Z = 16; V = 20,079.29 Den(Calc)= 2.75

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3c

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

By Intensity(I/I_o): 3.39(1), 3.54(0.67), 5.53(0.48),

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Physical Properties of Zincovoltaite

Cleavage:

None

Color:

Green, Greenish black, Black.

Density:

2.756

Diaphaniety:

Transparent to Translucent

Hardness:

3 - Calcite

Luster:

Vitreous - Resinous

Streak:

gray green

Optical Properties of Zincovoltaite

Gladstone-Dale:

CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.22,KPDmeas= 0.2195,KC= 0.2162

Optical Data:

Isotropic, n=1.605.

Calculated Properties of Zincovoltaite

Electron Density:

r_electron=2.75 gm/cc
note: r_{Zincovoltaite}=2.76 gm/cc.

Fermion Index

Fermion Index = 0.0098
Boson Index = 0.9902

Photoelectric:

PE_{Zincovoltaite}= 11.50 barns/electron
U=PE_{Zincovoltaite} x r_electron= 31.59 barns/cc.

Radioactivity:

GRapi = 54.16 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Zincovoltaite - barely detectable

Zincovoltaite Classification

Dana Class:

29.9.1.2 (29)Hydrated Acid and Sulfates

(29.9)with miscellaneous formulae

(29.9.1)Dana Group

29.9.1.1 Voltaite K2Fe5Fe3Al(SO4)12·18(H2O) F d3c 4/m 3 2/m

29.9.1.2 Zincovoltaite K2Zn5Fe3Al(SO4)12·18(H2O) F d3c 4/m 3 2/m

Strunz Class:

VI/C.14-60 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium and very big size

VI/C.14 - Sodium alum - Zincovoltaite series

VI/C.14-10 Sodium-alum NaAl(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-20 Potassium-alum KAl(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-30 Tschermigite (NH4)Al(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-40 Lonecreekite (NH4)(Fe,Al)(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-45 Lanmuchangite! TlAl(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-50 Voltaite K2Fe5Fe3Al(SO4)12·18(H2O) F d3c 4/m 3 2/m

VI/C.14-60 Zincovoltaite K2Zn5Fe3Al(SO4)12·18(H2O) F d3c 4/m 3 2/m

Other Zincovoltaite Information

References:

PHYS. PROP.(Am.Min.,Vol.75,p244,1990) OPTIC PROP.(Am.Min.,Vol.75,p244,1990)

See Also:

Links to other databases for Zincovoltaite :
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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Print or Cut-and-Paste your Zincovoltaite Specimen Label here :

Zincovoltaite

K2Zn5Fe+++3Al(SO4)12·18(H2O)
Dana No: 29.9.1.2 Strunz No: VI/C.14-60
Locality:

Notes: