Šlikite
A valid IMA mineral species
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About Šlikite
Štěpán Šlik
Formula:
Zn2Mg(CO3)2(OH)2 · 4H2O
Colour:
snow-white (aggregates)
Lustre:
Vitreous
Hardness:
2
Crystal System:
Triclinic
Name:
Named by Sejkora, J., Grey. I.E., Kampf, A.R., Mumme. W.G., Bureš, B., Čejka, J. in 2019 to honor of prominent Bohemian-German aristocrat Štěpán Šlik (1487–1526) - founder of St. Joachimsthal (now Jáchymov) town.
New structure type. Unique combination of elements among the currently accepted minerals (compare 'UM1986-10-CO:ClHMgMnZn (also called Mineral F, Dunn, 1995)'). A rare case of a non-silicate oxysalt with separate Zn and Mg sites (compare reaphookhillite).
Associates also include a ktenasite-like mineral.
Structural details:
- heteropolyhedral layers, [Zn4Mg(CO3)4(OH)4]2−, || {001}
- interlayer H-bonded [Mg(H2O)6]2+ octahedra and H2O
- the Mg-centred octahedra share corners with corner-joined ZnO2(OH)2 tetrahedra to form [110] chains
- CO3 groups join the two types of polyhedra
Associates also include a ktenasite-like mineral.
Structural details:
- heteropolyhedral layers, [Zn4Mg(CO3)4(OH)4]2−, || {001}
- interlayer H-bonded [Mg(H2O)6]2+ octahedra and H2O
- the Mg-centred octahedra share corners with corner-joined ZnO2(OH)2 tetrahedra to form [110] chains
- CO3 groups join the two types of polyhedra
Name Encoding
Latin-1:
Slikite
ASCII-7:
Slikite
Unique Identifiers
Mindat ID:
53362
Long-form identifier:
mindat:1:1:53362:9
IMA Classification of Šlikite
Approved
IMA Formula:
Zn2+2Mg(CO3)2(OH)2·4H2O
Approval year:
2019
First published:
2019
Type description reference:
Classification of Šlikite
5.DA.60
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
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 |
|---|---|---|
| Šlk | 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 Šlikite
Vitreous
Colour:
Snow-white (aggregates)
Streak:
White
Hardness:
2 on Mohs scale
Comment:
ca.
Tenacity:
Brittle
Cleavage:
Perfect
on {001}
on {001}
Fracture:
Irregular/Uneven
Comment:
fibres are slightly flexible
Optical Data of Šlikite
Type:
Biaxial (-)
RI values:
nα = 1.50(1) nβ = 1.55(1) nγ = 1.59(1)
Max. Birefringence:
δ = 0.090
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:
None to Very Low
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 biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
No measured or calculated 2V is on file for this mineral, so the value used here (81°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
No measured or calculated 2V is on file for this mineral, so the value used here (81°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Chemistry of Šlikite
Mindat Formula:
Zn2Mg(CO3)2(OH)2 · 4H2O
Element Weights:
Crystallography of Šlikite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.335(4) Å, b = 6.340(1) Å, c = 13.923(4) Å
α = 99.985(7)°, β = 92.74(1)°, γ = 114.93(2)°
α = 99.985(7)°, β = 92.74(1)°, γ = 114.93(2)°
Ratio:
a:b:c = 0.999 : 1 : 2.196
Unit Cell V:
494.8 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 13.57 Å | (100) |
| 4.525 Å | (31) |
| 3.573 Å | (2) |
| 3.406 Å | (5) |
| 3.394 Å | (5) |
| 3.326 Å | (1) |
| 2.996 Å | (3) |
| 2.773 Å | (3) |
Reference:
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Šlikite
General Appearance of Type Material:
very thin blades (fibres), flattened on {001} and elongated along [110], up to 200 μm in length; they constitute radial aggregates, up to 2 mm across
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collection of the National Museum, Prague, Czech Republic, catalogue number P1P 46/2018, and the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 67057
Geological Setting of Type Material:
vugs and surfaces of skarn fragments
Associated Minerals at Type Locality:
Synonyms of Šlikite
Other Language Names for Šlikite
Common Associates
Associations Based on Photo Data:
| 3 photos of Šlikite associated with Ktenasite | ZnCu4(SO4)2(OH)6 · 6H2O |
| 2 photos of Šlikite associated with Aragonite | CaCO3 |
| 1 photo of Šlikite associated with Zincowoodwardite | Zn1-xAlx(OH)2[SO4]x/2 · nH2O |
| 1 photo of Šlikite associated with Rapidcreekite | Ca2(SO4)(CO3) · 4H2O |
Related Minerals - Strunz-mindat Grouping
| 5.DA. | Alexkhomyakovite | K6(Ca2Na)(CO3)5Cl · 6H2O |
| 5.DA. | Amoraite | Ca12Al6(OH)36(CO3)2(SO3) · 15H2O |
| 5.DA.05 | Dypingite | Mg5(CO3)4(OH)2 · 5H2O |
| 5.DA.05 | 'UM1986-10-CO:ClHMgMnZn (also called Mineral F, Dunn, 1995)' | Mg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O |
| 5.DA.05 | 'UM1987-01-CO:HMgS' | Mg4(CO3)2(OH)4 · 6H2O ? |
| 5.DA.05 | Giorgiosite | Mg5(CO3)4(OH)2 · 5-6H2O |
| 5.DA.05 | Hydromagnesite | Mg5(CO3)4(OH)2 · 4H2O |
| 5.DA.05 | Widgiemoolthalite | Ni5(CO3)4(OH)2 · 5H2O |
| 5.DA.10 | Artinite | Mg2(CO3)(OH)2 · 3H2O |
| 5.DA.10 | Chlorartinite | Mg2(CO3)(OH)Cl · 2H2O |
| 5.DA.10 | Indigirite | Mg2Al2(CO3)4(OH)2 · 15H2O |
| 5.DA.15 | Zaratite | Ni3(CO3)(OH)4 · 4H2O ? |
| 5.DA.15 | Otwayite | Ni2(CO3)(OH)2 · H2O |
| 5.DA.20 | Kambaldaite | NaNi4(CO3)3(OH)3 · 3H2O |
| 5.DA.25 | Callaghanite | Cu2Mg2(CO3)(OH)6 · 2H2O |
| 5.DA.30 | Claraite | (Cu,Zn)15(CO3)4(AsO4)2(SO4)(OH)14 · 7H2O |
| 5.DA.35 | Hydroscarbroite | Al14(CO3)3(OH)36 · nH2O |
| 5.DA.35 | Scarbroite | Al5(CO3)(OH)13 · 5H2O |
| 5.DA.40 | Karchevskyite | Mg18Al9(OH)54Sr2(CO3)9(H2O)6(H3O)5 |
| 5.DA.40 | 'UM1987-05-OH:AlCMg' | Mg4Al2(OH)12(CO3,SO4) · 3H2O |
| 5.DA.40 | Quintinite | Mg4Al2(OH)12(CO3) · 3H2O |
| 5.DA.40 | Charmarite | Mn2+4Al2(OH)12[CO3] · 3H2O |
| 5.DA.40 | Caresite | Fe2+4Al2(OH)12[CO3] · 3H2O |
| 5.DA.45 | 'Hydrotalcite-2H' | Mg6Al2(CO3)(OH)16 · 4H2O |
| 5.DA.45 | 'Stichtite-2H' | Mg6(Cr,Al)2(CO3)(OH)16 · 4H2O |
| 5.DA.45 | Brugnatellite | Mg6Fe3+(CO3)(OH)13 · 4H2O |
| 5.DA.45 | Zaccagnaite | Zn4Al2(OH)12[CO3] · 3H2O |
| 5.DA.45 | 'Pyroaurite-2H' | Mg6Fe3+2(OH)16(CO3) · 4H2O |
| 5.DA.45 | Liudongshengite | Zn4Cr2(OH)12(CO3) · 3H2O |
| 5.DA.45 | Chlormagaluminite | Mg4Al2(OH)12Cl2 · 3H2O |
| 5.DA.50 | Pyroaurite | Mg6Fe3+2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Takovite | Ni6Al2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Reevesite | Ni6Fe3+2(OH)16(CO3) · 4H2O |
| 5.DA.50 | Kaznakhtite | Ni6Co3+2(CO3)(OH)16 · 4H2O |
| 5.DA.50 | Comblainite | Ni4Co2(OH)12[CO3] · 3H2O |
| 5.DA.50 | Marioantofilliite | [Cu4Al2(OH)12](CO3) · 3H2O |
| 5.DA.50 | Hydrotalcite | Mg6Al2(CO3)(OH)16 · 4H2O |
| 5.DA.50 | Stichtite | Mg6Cr3+2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Desautelsite | Mg6Mn3+2(OH)16[CO3] · 4H2O |
| 5.DA.55 | Coalingite | Mg10Fe3+2(OH)24[CO3] · 2H2O |
| 5.DA.55 | Akopovaite | Al4Li2(OH)12(CO3)(H2O)3 |
| 5.DA.65 | Marklite | Cu5(CO3)2(OH)6 · 6H2O |
Fluorescence of Šlikite
non-fluorescent
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 Šlikite
mindat.org URL:
https://www.mindat.org/min-53362.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Šlikite
Reference List:
Miyawaki, Ritsuro, Hålenius, Ulf, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2019) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) NEWSLETTER 47. European Journal of Mineralogy, 31 (1) 197-202 doi:10.1127/ejm/2019/0031-2839
Localities for Šlikite
Showing 10 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.
Austria | |
| Auer (2020) |
| Auer (2020) | |
Czech Republic (TL) | |
| Sejkora et al. (2019) |
France | |
| Christian BERBAIN collection - Georges ... |
Germany | |
| Möhn |
Greece | |
| Rieck et al. (2020) |
| Rieck et al. (2020) |
| Rieck et al. (2020) | |
Spain | |
| Georges FAVREAU collection and EDX ... |
| Xevi Ortiz collection. |
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Vladimír shaft, Plavno mine, Hanušov, Ostrov, Karlovy Vary District, Karlovy Vary Region, Czech Republic