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Zemkorite

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Formula:
Na2Ca(CO3)2
System:
Hexagonal
Colour:
Colourless
Lustre:
Vitreous, Pearly
Hardness:
2
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)'.


Classification of Zemkorite

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 Zemkorite

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

Optical Data of Zemkorite

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 Zemkorite

Formula:
Na2Ca(CO3)2
Elements listed in formula:
Analytical Data:
Electron microprobe, wt.%, mean of 2 analyses, CO2 by wet methods
CO2 39.20
Al2O3 0.05
CaO 28.39 
Na2O 25.72
K2O 6.40

total 99.76
Common Impurities:
K

Crystallography of Zemkorite

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

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
Empirical Formula:
(Na1.80K0.29)Σ2.09Ca1.10(CO3)1.93
Associated Minerals at Type Locality:

Relationship of Zemkorite to other Species

Member of:
5.AC.05EiteliteNa2Mg(CO3)2
5.AC.10NyerereiteNa2Ca(CO3)2
5.AC.15BütschliiteK2Ca(CO3)2
5.AC.20FairchilditeK2Ca(CO3)2
5.AC.25ShortiteNa2Ca2(CO3)3
5.AC.30Burbankite(Na,Ca)3(Sr,Ba,Ce)3(CO3)5
5.AC.30CalcioburbankiteNa3(Ca,Ce,Sr,La)3(CO3)5
5.AC.30Khanneshite(Na,Ca)3(Ba,Sr,Ce,Ca)3(CO3)5
5.AC.30SanromániteNa2CaPb3(CO3)5
11.1.1ZabuyeliteLi2CO3
11.1.2NatriteNa2CO3
11.1.3NahcoliteNaHCO3
11.1.4WegscheideriteNa5H3(CO3)4
11.1.5ThermonatriteNa2CO3 · H2O
11.1.6TronaNa3(HCO3)(CO3) · 2H2O
11.1.7NatronNa2CO3 · 10H2O
11.1.8KaliciniteKHCO3
11.1.9ShortiteNa2Ca2(CO3)3
11.1.10NyerereiteNa2Ca(CO3)2
11.1.11NatrofairchilditeNa2Ca(CO3)2
11.1.13PirssoniteNa2Ca(CO3)2 · 2H2O
11.1.14GaylussiteNa2Ca(CO3)2 · 5H2O
11.1.15BaylissiteK2Mg(CO3)2 · 4H2O
11.1.16FairchilditeK2Ca(CO3)2
11.1.17BütschliiteK2Ca(CO3)2
11.1.18Teschemacherite(NH4)HCO3

Other Names for Zemkorite

Name in Other Languages:
German:Zemkorit
Spanish:Zemkorita

Other Information

Other Information:
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 Zemkorite

Reference List:
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 Zemkorite

mindat.org URL:
https://www.mindat.org/min-4393.html
Please feel free to link to this page.

Localities for Zemkorite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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