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Zemkorite

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Formula:
Na2Ca(CO3)2
Colour:
Colourless
Lustre:
Vitreous, Pearly
Hardness:
2
Specific Gravity:
2.46
Crystal System:
Hexagonal
Member of:
Name:
Named after the acronym for the Russian "Zemnoy Kory", the Institute of Earth's Crust, Academy of Science, Siberian Branch, Novosibirsk (Russia).
Dimorph of:
The Na analogue of fairchildite. There is likely a solid solution between the two species, as suggested by the empirical formula of the current species.

There are a few synthetic HP chemically close compounds, e.g., 'Unnamed (Na-Ca Carbonate I)'.


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Classification of ZemkoriteHide

Approved
Approval Year:
1985
5.AC.10

5 : CARBONATES (NITRATES)
A : Carbonates without additional anions, without H2O
C : Alkali and alkali-earth carbonates
14.3.3.2

14 : ANHYDROUS NORMAL CARBONATES
3 : A2B(XO3)2
11.1.12

11 : Carbonates
1 : Carbonates of the alkali metals and ammonium

Physical Properties of ZemkoriteHide

Vitreous, Pearly
Transparency:
Transparent
Colour:
Colourless
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
lamellar
Density:
2.46(2) g/cm3 (Measured)    2.47(2) g/cm3 (Calculated)

Optical Data of ZemkoriteHide

Type:
Uniaxial (-)
RI values:
nω = 1.535 nε = 1.513
Max Birefringence:
δ = 0.022
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of ZemkoriteHide

Formula:
Na2Ca(CO3)2
Common Impurities:
K

Crystallography of ZemkoriteHide

Crystal System:
Hexagonal
Cell Parameters:
a = 10.06(2) Å, c = 12.72(1) Å
Ratio:
a:c = 1 : 1.264
Unit Cell V:
1,114.84 ų (Calculated from Unit Cell)
Z:
8
Comment:
P63/mmc, P-62c or P63mc

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.36 (100)
3.04 (100)
2.52 (100)
2.06 (100)
6.36 (90)
1.797 (80)
2.18 (70)

Type Occurrence of ZemkoriteHide

General Appearance of Type Material:
granular massive in veinlets and fracture fillings; rarely as fan-like aggregates of anhedral crystals, up to 0.5 mm
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia (registration no. 87573)
Geological Setting of Type Material:
kimberlites
Associated Minerals at Type Locality:

Synonyms of ZemkoriteHide

Other Language Names for ZemkoriteHide

German:Zemkorit
Spanish:Zemkorita

Relationship of Zemkorite to other SpeciesHide

Member of:

Related Minerals - Nickel-Strunz GroupingHide

5.AC.05EiteliteNa2Mg(CO3)2Trig.
5.AC.10NyerereiteNa2Ca(CO3)2Orth. mmm (2/m 2/m 2/m) : Cmcm
5.AC.15BütschliiteK2Ca(CO3)2Trig. 3m (3 2/m) : R3m
5.AC.20FairchilditeK2Ca(CO3)2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
5.AC.25ShortiteNa2Ca2(CO3)3Orth. mm2 : Amm2
5.AC.30Burbankite(Na,Ca)3(Sr,Ba,Ce)3(CO3)5Hex. 6mm : P63mc
5.AC.30CalcioburbankiteNa3(Ca,REE,Sr)3(CO3)5Hex. 6mm : P63mc
5.AC.30Khanneshite(Na,Ca)3(Ba,Sr,Ce,Ca)3(CO3)5Hex.
5.AC.30SanromániteNa2CaPb3[CO3]5Hex. 6mm : P63mc

Related Minerals - Dana Grouping (8th Ed.)Hide

14.3.3.1FairchilditeK2Ca(CO3)2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

11.1.1ZabuyeliteLi2CO3Mon. 2/m : B2/b
11.1.2NatriteNa2CO3Mon.
11.1.3NahcoliteNaHCO3Mon. 2/m
11.1.4WegscheideriteNa5H3(CO3)4Tric. 1 : P1
11.1.5ThermonatriteNa2CO3 · H2OOrth. mmm (2/m 2/m 2/m) : Pmmm
11.1.6TronaNa3H(CO3)2 · 2H2OMon. 2/m
11.1.7NatronNa2CO3 · 10H2OMon. 2/m : P2/m
11.1.8KaliciniteKHCO3Mon. 2/m
11.1.9ShortiteNa2Ca2(CO3)3Orth. mm2 : Amm2
11.1.10NyerereiteNa2Ca(CO3)2Orth. mmm (2/m 2/m 2/m) : Cmcm
11.1.11NatrofairchilditeNa2Ca(CO3)2Orth.
11.1.13PirssoniteNa2Ca(CO3)2 · 2H2OOrth. mm2 : Fdd2
11.1.14GaylussiteNa2Ca(CO3)2 · 5H2OMon. 2/m : B2/b
11.1.15BaylissiteK2Mg(CO3)2 · 4H2OMon.
11.1.16FairchilditeK2Ca(CO3)2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
11.1.17BütschliiteK2Ca(CO3)2Trig. 3m (3 2/m) : R3m
11.1.18Teschemacherite(NH4)HCO3Orth. mmm (2/m 2/m 2/m) : Pccn

Other InformationHide

Notes:
soluble in water
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 ZemkoriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Yegorov, N.K., Ushchapovskaya, Z.F., Kashayev, A.A., Bogdanov, G.V., Sizykh, Y.I. (1988) Zemkorite – a new carbonate from kimberlites of Yakutia [Sakha]. Doklady Akademii Nauk SSSR: 301: 188-193.
American Mineralogist (1990): 75: 933-934.
American Mineralogist (2002): 87: 1384.
Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)

Internet Links for ZemkoriteHide

Localities for ZemkoriteHide

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.
India
 
  • Andhra Pradesh
    • Anantapur District
AmMin 87:1384-1389 (2002)
Russia (TL)
 
  • Eastern-Siberian Region
    • Sakha Republic (Saha Republic; Yakutia)
      • Daldyn-Alakit kimberlite field
        • Daldyn
M. Kamenetsky et al. , Geophysical Research Abstracts, Vol. 5, 2003.; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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