Slavíkite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Slavíkite
František Slavík
Formula:
(H3O+)3Mg6Fe15(SO4)21(OH)18 · 98H2O
Originally assumed to be NaMg2Fe3+5(SO4)7(OH)6.33H2O.
Colour:
Pale yellow, pale yellow-green
Lustre:
Vitreous, Dull
Hardness:
3½
Specific Gravity:
1.905 - 1.99
Crystal System:
Trigonal
Name:
Named in 1926 by Rudolf Jirkovsky and František Ulrich in honor of František Slavík (July 18, 1876, Kutná Hora, Austria-Hungary (currently Czech Republic) - January 27, 1957, Prague, Czechoslovakia (currently Czech Republic)), Charles University in Prague where he was Dean of the Faculty of Science from 1924 to 1925 and Rector from 1937 to 1938 (Am. Mineral. 43, 325-330).
This page provides mineralogical data about Slavíkite.
Name Encoding
ASCII-7:
Slavikite
Unique Identifiers
Mindat ID:
3683
Long-form identifier:
mindat:1:1:3683:8
IMA Classification of Slavíkite
Approved
IMA status notes:
Renamed by the IMA
IMA Formula:
(H3O)1+3Mg6Fe3+15(S6+O4)21(OH)18·98H2O
Approval history:
Renamed by IMA: 2009
Classification of Slavíkite
7.DF.30
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
F : With large and medium-sized cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
F : With large and medium-sized cations
31.9.13.1
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
25.11.21
25 : Sulphates
11 : Sulphates of Fe and other metals
25 : Sulphates
11 : Sulphates of Fe and other metals
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Sví | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Slavíkite
Vitreous, Dull
Transparency:
Transparent
Colour:
Pale yellow, pale yellow-green
Hardness:
3½ on Mohs scale
Parting:
Parting on {0001}
Density:
1.905 - 1.99 g/cm3 (Measured)
Comment:
Values measured on Bohemian and Argentinian materials, respectively.
Optical Data of Slavíkite
Type:
Uniaxial (-)
RI values:
nω = 1.53 - 1.537 nε = 1.494 - 1.506
Max. Birefringence:
δ = 0.031 - 0.036
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Low (negative)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Pleochroism:
Visible
Comments:
Dichroic:
O = Lemon-yellow
E = Nearly colorless
O = Lemon-yellow
E = Nearly colorless
Chemistry of Slavíkite
Mindat Formula:
(H3O+)3Mg6Fe15(SO4)21(OH)18 · 98H2O
Originally assumed to be NaMg2Fe3+5(SO4)7(OH)6.33H2O.
Originally assumed to be NaMg2Fe3+5(SO4)7(OH)6.33H2O.
Element Weights:
Chemical Analysis
Oxide wt%:
| 1 | 2 | |
|---|---|---|
| H2O- | 29.7 % | 26.2 % |
| H2O+ | 11.0 % | 11.9 % |
| Fe2O3 | 14.8 % | 14.0 % |
| Al2O3 | 5.5 % | 6.8 % |
| FeO | 1.0 % | 0.6 % |
| MgO | 4.2 % | 2.8 % |
| SO3 | 32.8 % | 32.2 % |
| K2O | 0.3 % | |
| Na2O | 0.15 % | |
| Residue | 5.8 % | |
| Total: | 99 % | 100.75 % |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Franquenies, Ottignies-Louvain-la-Neuve, Walloon Brabant, Wallonia, Belgium | Analysis by Van Tassel & Van Stiphoudt | |
| 2 | Stavelot, Liège, Wallonia, Belgium | Analysis by Van Tassel & Van Stiphoudt |
Crystallography of Slavíkite
Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 12.2 Å, b = 12.2 Å, c = 35.13 Å
Ratio:
a:b:c = 1 : 1 : 2.88
Unit Cell V:
4,528.23 ų (Calculated from Unit Cell)
Z:
3
Morphology:
Crystals to 0.3mm scaly; tabular {0001} with prominent {10_11}; incrustations, efforvescences, fine granular, massive.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.47 Å | (very strong) |
| 4.20 Å | (very strong) |
| 2.93 Å | (very strong) |
| 5.85 Å | (strong) |
| 3.48 Å | (strong) |
| 3.13 Å | (strong) |
| 5.05 Å | (moderate) |
Comments:
Medzev, Czech Republic. The data are from Makovický and Streško (1967).
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] |
Geological Setting:
Oxidation product of pyrite in shales and slate.
Type Occurrence of Slavíkite
Place of Conservation of Type Material:
Charles University, Prague Czech Republic 8877
Geological Setting of Type Material:
Weathering pyritic shales.
Associated Minerals at Type Locality:
Synonyms of Slavíkite
Other Language Names for Slavíkite
Common Associates
Associations Based on Photo Data:
| 5 photos of Slavíkite associated with Gypsum | CaSO4 · 2H2O |
| 3 photos of Slavíkite associated with Halotrichite | Fe2+Al2(SO4)4 · 22H2O |
| 3 photos of Slavíkite associated with Pickeringite | MgAl2(SO4)4 · 22H2O |
| 1 photo of Slavíkite associated with Alunogen | Al2(SO4)3 · 17H2O |
| 1 photo of Slavíkite associated with Bílinite | Fe2+Fe3+2(SO4)4 · 22H2O |
| 1 photo of Slavíkite associated with Alpersite | (Mg,Cu2+)(H2O)6(SO4) · H2O |
| 1 photo of Slavíkite associated with Fibroferrite | Fe3+(SO4)(OH) · 5H2O |
Related Minerals - Strunz-mindat Grouping
| 7.DF. | Siligiite | [Pb(H2O)5(SO4)][Zn9(OH)18] |
| 7.DF. | Alcaparrosaite | K3Ti4+Fe3+(SO4)4O(H2O)2 |
| 7.DF. | Flaggite | Pb4Cu2+4Te6+2(SO4)2O11(OH)2(H2O) |
| 7.DF. | Bairdite | Pb2Cu2+4Te6+2O10(OH)2(SO4) · H2O |
| 7.DF. | Tzeferisite | CaZn8(SO4)2(OH)12Cl2(H2O)9 |
| 7.DF. | Cherokeeite | [Pb2Zn(OH)4](SO4) · H2O |
| 7.DF. | Ammoniomathesiusite | (NH4)5(UO2)4(SO4)4(VO5) · 4H2O |
| 7.DF. | Sigogglinite | [Pb6Zn(OH)8]2(SO4)6 · (H2O)8-x |
| 7.DF.X | Blueridgeite | [Pb8Zn3Cu2+(OH)16](SO4)2(S2O3)2 · 2H2O |
| 7.DF. | Erssonite | Mg7Fe3+2(OH)18[Ca(H2O)6](SO4)2 · 12H2O |
| 7.DF. | Poellmannite | Ca6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O |
| 7.DF. | Carlsonite | (NH4)5Fe3+3O(SO4)6 · 7H2O |
| 7.DF. | Cuprocherokeeite | [Pb8Zn3Cu2+(OH)16](SO4)4 · 4H2O |
| 7.DF. | Haywoodite | [Pb(H2O)10][Zn12(OH)20(H2O)(SO4)3] |
| 7.DF. | Chromschieffelinite | Pb10Te6+6O20(OH)14(CrO4)(H2O)5 |
| 7.DF.05 | Uklonskovite | NaMg(SO4)F · 2H2O |
| 7.DF.10 | Kainite | KMg(SO4)Cl · 3H2O |
| 7.DF.10 | Kaliochalcite | KCu2(SO4)2[(OH)(H2O)] |
| 7.DF.15 | Natrochalcite | NaCu2(SO4)2(OH) · 2H2O |
| 7.DF.17 | Genplesite | Ca3Sn(SO4)2(OH)6 · 3H2O |
| 7.DF.17 | 'Unnamed (Ba-Sb Silicate-Sulphate-Hydroxide-Hydrate)' | Ba3Sb5+[(Si,S)O3(OH)]2(OH,O)6 · 3H2O |
| 7.DF.20 | Sideronatrite | Na2Fe(SO4)2(OH) · 3H2O |
| 7.DF.20 | Metasideronatrite | Na2Fe(SO4)2(OH) · H2O |
| 7.DF.25 | Fleischerite | Pb3Ge(SO4)2(OH)6 · 3H2O |
| 7.DF.25 | Mallestigite | Pb3Sb5+(SO4)(AsO4)(OH)6 · 3H2O |
| 7.DF.25 | Schaurteite | Ca3Ge(SO4)2(OH)6 · 4H2O |
| 7.DF.25 | Despujolsite | Ca3Mn4+(SO4)2(OH)6 · 3H2O |
| 7.DF.35 | Metavoltine | K2Na6Fe2+Fe3+6O2(SO4)12 · 18H2O |
| 7.DF.40 | Lannonite | Mg2Ca4Al4(SO4)8F8 · 24H2O |
| 7.DF.40 | Vlodavetsite | AlCa2(SO4)2F2Cl · 4H2O |
| 7.DF.45 | Peretaite | Ca(SbO)4(SO4)2(OH)2 · 2H2O |
| 7.DF.50 | Gordaite | NaZn4(SO4)(OH)6Cl · 6H2O |
| 7.DF.50 | Calamaite | Na2TiO(SO4)2 · 2H2O |
| 7.DF.52 | Huizingite-(Al) | [(NH4)9(SO4)2][(Al,Fe3+)3(OH)2(H2O)4(SO4)6] |
| 7.DF.52 | Scordariite | K8(Fe3+0.67◻0.33)[Fe3+3O(SO4)6]2 · 14H2O |
| 7.DF.55 | Clairite | (NH4)2Fe3(SO4)4(OH)3 · 3H2O |
| 7.DF.55 | Giacovazzoite | K5Fe3+3O(SO4)6 · 10H2O |
| 7.DF.57 | Magnanelliite | K3Fe3+2(SO4)4(OH)(H2O)2 |
| 7.DF.60 | Arzrunite | Cu4Pb2(SO4)(OH)4Cl6 · 2H2O (?) |
| 7.DF.60 | Evdokimovite | Tl4(VO)3(SO4)5(H2O)5 |
| 7.DF.62 | Bridgesite-(Ce) | CaCe2Cu6(SO4)4(OH)12 · 8H2O |
| 7.DF.65 | Elyite | Pb4Cu(SO4)O2(OH)4 · H2O |
| 7.DF.70 | Yecoraite | Fe3+3Bi5(Te6+O4)2(Te4+O3)O9 · 9H2O |
| 7.DF.70 | Lautenthalite | PbCu4(SO4)2(OH)6 · 3H2O |
| 7.DF.75 | Riomarinaite | Bi(SO4)(OH) · H2O |
| 7.DF.80 | Dukeite | Bi3+24Cr6+8O57(OH)6 · 3H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Slavíkite
mindat.org URL:
https://www.mindat.org/min-3683.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Slavíkite
Reference List:
Localities for Slavíkite
Showing 61 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Argentina | |
| Palache et al. (1951) |
Austria | |
| Meixner (1950) |
| Hammer et al. (2004) |
| Palache et al. (1951) +1 other reference |
| Bernhard (2006) |
| Meixner (1973) |
| Kolitsch (2014) |
| Meixner (1980) +1 other reference |
| Kolitsch (2020) |
Belgium | |
| Van Tassel (1956) +3 other references |
| Van Tassel (1956) +2 other references | |
| Van Tassel (1944) +4 other references |
Bulgaria | |
| Младенова et al. (2007) |
Canada | |
| Ogilvie (1979) |
Czech Republic | |
| Litochleb et al. (2000) |
| Palache et al. (1951) +1 other reference |
| Matýsek et al. (2023) |
| Kuttna +1 other reference |
| Rost (1955) |
| Matýsek et al. (2024) |
| Anthony et al. (2003) |
France | |
| R. Pierrot |
| Lenfant (1964) | |
| Mineralogical Society of America - ... |
Germany | |
| Witzke et al. (1998) |
| Liebeskind et al. (1992) |
Greece | |
| Möckel (2001) |
| Rieck (n.d.) | |
Hungary | |
| Anthony et al. (2016) |
| Szakáll et al. (1997) | |
| HOM Collection 2005 |
Italy | |
| Andreoli et al. (1978) |
| Sorrell (n.d.) | |
Norway | |
| Raade (1973) +1 other reference |
| Wilke (1976) +1 other reference | |
| Sigurd Stordal collection | |
| Selbekk et al. (2010) |
| Nordrum (2004) |
| selfcollected by Sigurd Stordal | |
| Rune S. Selbekk (2010) |
| Tor Witsø pers. com to Knut Edvard ... +1 other reference |
| Witsø (1995) | |
| Witsø (2005) | |
Poland | |
| Siuda (2004) +3 other references |
| Balcerzak et al. (1992) | |
| Mochnacka et al. (2015) | |
Romania | |
| Edited by Szakáll-Kristály (2010) |
Slovakia | |
| Uher et al. (2000) |
| Koděra et al. (1986) |
| Koděra (1990) | |
| Koděra et al. (1986) |
| Grecula (1995) |
| Koděra et al. (1986) | |
| Luigi Chiappino collection |
Spain | |
| Christophe Boutry collection |
| Christophe Boutry collection | |
| Sainz de Baranda Graf et al. (2025) +1 other reference |
| Crespo et al. (2017) |
Switzerland | |
| Ansermet (2012) |
USA | |
| Robert Matthew Joeckel et al. (2007) |
| Flohr et al. (1995) +2 other references |
Quick NavTopAbout SlavíkiteName EncodingUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Chemical AnalysisCrystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Varios Amigos Mine, Santa Cruz de Marchena, Almería, Andalusia, Spain