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Šlikite

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About ŠlikiteHide

Formula:
Zn2Mg(CO3)2(OH)2·4H2O
Colour:
snow-white (aggregates)
Lustre:
Vitreous
Hardness:
2
Crystal System:
Triclinic
Name:
In honour of prominent Czech 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


Classification of ŠlikiteHide

Approved, Pending publication
Approval Year:
2019

Physical Properties of ŠlikiteHide

Vitreous
Colour:
snow-white (aggregates)
Streak:
white
Hardness:
Comment:
ca.
Tenacity:
Brittle
Cleavage:
Perfect
on {001}
Fracture:
Irregular/Uneven
Comment:
fibres are slightly flexible

Optical Data of ŠlikiteHide

Type:
Biaxial (-)
RI values:
nα = 1.500(1) nβ = 1.550(1) nγ = 1.590(1)
Max Birefringence:
δ = 0.090
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of ŠlikiteHide

Formula:
Zn2Mg(CO3)2(OH)2·4H2O

Crystallography of ŠlikiteHide

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)°
Ratio:
a:b:c = 0.999 : 1 : 2.196
Unit Cell V:
494.8 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
13.57Å(100)
4.525Å(31)
3.573Å(2)
3.406Å(5)
3.394Å(5)
3.326Å(1)
2.996Å(3)
2.773Å(3)
Comments:
From Type Description.

Type Occurrence of ŠlikiteHide

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 ŠlikiteHide

Fluorescence of ŠlikiteHide

non-fluorescent

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ŠlikiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sejkora, J., Grey, I.E., Kampf, A.R., Mumme, W.G., Bureš, B. and Čejka, J. (2019) Šlikite, IMA 2018-120. CNMNC Newsletter No. 47, February 2019, page 202; European Journal of Mineralogy, 31: 199–204.
Sejkora, J., Grey. I.E., Kampf, A.R., Mumme. W.G., Bureš, B., Čejka, J. (2019): Šlikite, Zn2Mg(CO3)2(OH)2·4H2O, a new Zn–Mg carbonate from Plavno, Jáchymov ore district, Czech Republic. European Journal of Mineralogy: 31 (in press);

Internet Links for ŠlikiteHide

Localities for ŠlikiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Czech Republic (TL)
 
  • Karlovy Vary Region
    • Karlovy Vary District
      • Ostrov
Sejkora, J., Grey, I.E., Kampf, A.R., Mumme, W.G., Bureš, B. and Čejka, J. (2019) Šlikite, IMA 2018-120. CNMNC Newsletter No. 47, February 2019, page 202; European Journal of Mineralogy, 31: 199–204.
 
Mineral and/or Locality  
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