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Karchevskyite

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Formula:
Mg18Al9(OH)54Sr2(CO3)9(H2O)6 (H3O)5
Colour:
Colourless to white
Lustre:
Vitreous, Pearly
Hardness:
2
Specific Gravity:
2.21
Crystal System:
Trigonal
Name:
Named in honor of Pavel Karehevsky (Павла Карчевского) (1976-2002), Russian mineralogist, for his contributions to study of carbonatite massifs.
Belongs to hydrotalcite-like layered double hydroxides.


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Classification of KarchevskyiteHide

Approved
Approval Year:
2005

Physical Properties of KarchevskyiteHide

Vitreous, Pearly
Colour:
Colourless to white
Hardness:
Tenacity:
Flexible
Cleavage:
Perfect
on {001}
Density:
2.21 g/cm3 (Measured)    2.18 g/cm3 (Calculated)

Optical Data of KarchevskyiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.542 nε = 1.534
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic

Chemical Properties of KarchevskyiteHide

Formula:
Mg18Al9(OH)54Sr2(CO3)9(H2O)6 (H3O)5
IMA Formula:
Mg18Al9(OH)54Sr2(CO3)9(H2O)6(H3O)5

Crystallography of KarchevskyiteHide

Crystal System:
Trigonal
Cell Parameters:
a = 16.055 Å, c = 25.66 Å
Ratio:
a:c = 1 : 1.598
Unit Cell V:
5728 ų
Z:
3

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.52 (100)
6.41 (40)
5.13 (30)
4.27 (60)
3.665 (90)
3.547 (90)
3.081 (60)
Comments:
Format: d/A, I, (hkl)

Type Occurrence of KarchevskyiteHide

General Appearance of Type Material:
spherulites up to 1 mm in diameter, composed of thin bended ductile plates
Place of Conservation of Type Material:
Mineralogical Museum, Department of Mineralogy, St. Petersburg State University, Russia.
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow.
Geological Setting of Type Material:
late-stage hydrothermal environment
Associated Minerals at Type Locality:

Synonyms of KarchevskyiteHide

Relationship of Karchevskyite to other SpeciesHide

Other Members of this group:
MotukoreaiteMg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2OTrig. 3m (3 2/m) : R3m
NatroglaucoceriniteZn6Al3(OH)18[Na(H2O)6](SO4)2•6H2OHex.
NikischeriteFe2+6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2OTrig.
ShigaiteMn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2OTrig.
WermlanditeMg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2OTrig. 3m (3 2/m) : P3c1

Fluorescence of KarchevskyiteHide

Other InformationHide

IR Spectrum:
wave numbers in 1/cm (s: shoulder):

3470, 3420 s, 3035, 2960s, 1650, 1426, 1366 (quintinite impurity), 1024, 937, 860, 779, 678, 615s, 553, 449, 386
Thermal Behaviour:
Thermogravimetric Analysis (TGA):

- 12.2 wt.-% (230°C)
- 6.1 wt.-% (320°C)
- 23.7 wt.-% (440°C)

corresponding to a total weight loss of 42.0 wt.-%
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 KarchevskyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Britvin, S.N., Chukanov, N.V., Bekenova, G.K., Tagovkina, M.A., Antonov, A.V., Bogdanova, A.N., and Krasnova, N.I. (2008): Karchevskyite, [Mg18Al9(OH)54][Sr2(CO3,PO4)9(H2O,H3O)11]a new mineral species of the layered double hydroxide family. Geology of Ore Deposits, 50,556-564.
Mills, S.J., Christy, A.G., Genin, J.-M.R., Kameda, T., Colombo, F. (2012): Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76, 1289-1336.

Internet Links for KarchevskyiteHide

Localities for KarchevskyiteHide

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.
Russia (TL)
 
  • Northern Region
    • Murmanskaya Oblast'
      • Kovdor Massif
Britvin, S. N., Chukanov, N. V., Bekenova, G. K., Yagovkina, M. A., Antonov, A. V., Bogdanova, A. N., & Krasnova, N. I. (2008). Karchevskyite,[Mg18Al9 (OH) 54][Sr2 (CO3, PO4) 9 (H2O, H3O) 11], a new mineral species of the layered double hydroxide family. Geology of Ore Deposits, 50(7), 556-564.
Mineral and/or Locality  
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