Slavikite Mineral Data

Slavikite Mineral Data +

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General Slavikite Information

Chemical Formula:

NaMg2Fe+++5(SO4)7(OH)6·33(H2O)

Composition:

Molecular Weight = 1,719.83 gm

Sodium 1.34 % Na 1.80 % Na₂O

Magnesium 2.83 % Mg 4.69 % MgO

Iron 16.24 % Fe 23.21 % Fe₂O₃

Hydrogen 4.22 % H 37.71 % H₂O

Sulfur 13.05 % S 32.59 % SO₃

Oxygen 62.33 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaMg₂Fe³⁺₅(SO₄)₇(OH)₆·33(H₂O)

Environment:

Formed as a weathering product of pyritic shales. Found with other acid (low pH) sulfates.

IMA Status:

Valid Species (Pre-IMA) 1926

Locality:

Valachov Hill, near Skrivany, Bohemia, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named after the Czech mineralogist, Frantisek Slavik (1876-1957).

Synonym:

ICSD 4303

PDF 20-679

Slavikite Image

Images:

Slavikite

Comments: Bubbly slavikite crust.
Location: Smolnicka Huta, Vychodoslovensky, Slovakia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Slavikite Crystallography

Axial Ratios:

a:c = 1:2.8795

Cell Dimensions:

a = 12.2, c = 35.13, Z = 3; V = 4,528.23 Den(Calc)= 1.89

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

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

By Intensity(I/I_o): 9.04(1), 5.83(0.8), 11.7(0.8),

Forms:

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Forms: [ 2 0 5] [ 1 0 1] [ 0 2 1] [ 0 5 2] [ 0 0 1]

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Crystal Structure:

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Susse P , Neues Jahrbuch fur Mineralogie, Monatshefte , 1973 (1973) p.93-95, Slavikit: kristallstruktur und chemische formel, Locality: La Alcaparros, Argentina

View Additional jPOWD Structure files for Slavikite
[1]

Physical Properties of Slavikite

Color:

Yellowish green.

Density:

1.9 - 2.1, Average = 2

Diaphaniety:

Transparent

Fracture:

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

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

pale yellowish green

Optical Properties of Slavikite

Dichroism (e):

colorless.

Dichroism (w):

lemon yellow.

Gladstone-Dale:

CI meas= 0.062 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2697,KPDmeas= 0.2549,KC= 0.2718

Optical Data:

Uniaxial (-), e=1.497-1.506, w=1.506-1.53, bire=0.0090-0.0240.

Calculated Properties of Slavikite

Electron Density:

r_electron=1.95 gm/cc
note: r_Slavikite=1.89 gm/cc.

Fermion Index

Fermion Index = 0.00755
Boson Index = 0.99245

Photoelectric:

PE_Slavikite= 5.58 barns/electron
U=PE_Slavikite x r_electron= 10.86 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Slavikite is Not Radioactive

Slavikite Classification

Dana Class:

31.9.13.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.9)where (A+ B++) (XO4) Zq·x(H2O)

(31.9.13)Dana Group

31.9.13.1 Slavikite NaMg2Fe5(SO4)7(OH)6·33(H2O) R 3 3

Strunz Class:

VI/D.14-40 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size

VI/D.14 - Metavoltine - Slavikite series

VI/D.14-10 Metavoltine K4Na4(Fe,Zn)Fe6(SO4)12O2·20(H2O) P 3 3

VI/D.14-20 Motukoreaite Na2Mg38Al24(CO3)13(SO4)8(OH)108·56(H2O) R 3m 3 2/m

VI/D.14-22 Nikischerite! NaFe6Al3(SO4)2(OH)18(H2O)12 R 3 3

VI/D.14-23 Shigaite Mn7Al4(SO4)2(OH)22·8(H2O) R 3 3

VI/D.14-25 Wermlandite (Ca,Mg)Mg7(Al,Fe)2(SO4)2(OH)18·12(H2O) P 3c1 3 2/m

VI/D.14-30 Lannonite HCa4Mg2Al4(SO4)8F9·32(H2O) Unk Tetra

VI/D.14-40 Slavikite NaMg2Fe5(SO4)7(OH)6·33(H2O) R 3 3

Other Slavikite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Slavikite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Slavikite Specimen Label here :

Slavikite

NaMg2Fe+++5(SO4)7(OH)6·33(H2O)
Dana No: 31.9.13.1 Strunz No: VI/D.14-40
Locality:

Notes: