Slavikite Mineral Data

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).

Name Pronunciation:

Slavikite + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.51 - 1.57

Optical Data:

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

Calculated Properties of Slavikite

Electron Density:

Bulk Density (Electron Density)=1.95 gm/cc
note: Specific Gravity of Slavikite =1.89 gm/cc.

Fermion Index:

Fermion Index = 0.0075528899
Boson Index = 0.9924471101

Photoelectric:

PE_Slavikite= 5.58 barns/electron
U=PE_Slavikite x rElectron Density= 10.86 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Slavikite is Not Radioactive

Slavikite Classification

Dana Class:

31.09.13.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.09)where (A+ B++) (XO4) Zq·x(H2O)

(31.09.13)Dana Group

31.09.13.01 Slavikite NaMg2Fe5(SO4)7(OH)6•33(H2O) R 3 3

Strunz Class:

07.DF.30 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DF -With large and medium-sized cations

07.DF.30 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Slavikite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Slavikite

NaMg2Fe+++5(SO4)7(OH)6•33(H2O)
Dana No: 31.09.13.01 Strunz No: 07.DF.30
Locality:

Notes: