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Zemkorite

Formula:
Na
 
2
Ca(CO
 
3
)
 
2
System:HexagonalColour:Colourless
Hardness:2
Name:From Russian "ZEMNOY KORY" an acronym for the Institute of Earth's Crust, Academy of Science, Siberian Branch, Novosibirsk (Russia).


Eitelite Group

Classification of Zemkorite

IMA status:Approved 1985
Strunz 8th edition ID:5/B.05-55
Nickel-Strunz 10th (pending) edition ID:5.AC.10

5 : CARBONATES (NITRATES)
A : Carbonates without additional anions, without H2O
C : Alkali and alkali-earth carbonates
Dana 8th edition ID:14.3.3.2

14 : ANHYDROUS NORMAL CARBONATES
3 : A2B(XO3)2
Hey's CIM Ref.:11.1.12

11 : Carbonates
1 : Carbonates of the alkali metals and ammonium
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Physical Properties of Zemkorite

Lustre:Vitreous, Pearly
Diaphaneity (Transparency):Transparent
Colour:Colourless
Hardness (Mohs):2
Tenacity:Brittle

Crystallography of Zemkorite

Crystal System:Hexagonal
Cell Parameters:a = 10.06Å, c = 12.72Å
Ratio:a:c = 1 : 1.264
Unit Cell Volume:V 1,114.84 ų (Calculated from Unit Cell)

Optical Data of Zemkorite

Type:Uniaxial (-)
RI values: nω = 1.535 nε = 1.513
Maximum Birefringence:δ = 0.022

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low

Chemical Properties of Zemkorite

Formula:
Na
 
2
Ca(CO
 
3
)
 
2
Essential elements:C, Ca, Na, O
All elements listed in formula:C, Ca, Na, O
Common Impurities:K

Relationship of Zemkorite to other Species

Related Minerals - Nickel-Strunz Grouping):
5.AC.05Eitelite
Na
 
2
Mg(CO
 
3
)
 
2
5.AC.10Nyerereite
Na
 
2
Ca(CO
 
3
)
 
2
5.AC.15Bütschliite
K
 
2
Ca(CO
 
3
)
 
2
5.AC.20Fairchildite
K
 
2
Ca(CO
 
3
)
 
2
5.AC.25Shortite
Na
 
2
Ca
 
2
(CO
 
3
)
 
3
5.AC.30Burbankite
(Na,Ca)
 
3
(Sr,Ba,Ce)
 
3
(CO
 
3
)
 
5
5.AC.30Calcioburbankite
Na
 
3
(Ca,REE,Sr)
 
3
(CO
 
3
)
 
5
5.AC.30Khanneshite
(Na,Ca)
 
3
(Ba,Sr,Ce,Ca)
 
3
(CO
 
3
)
 
5
5.AC.30Sanrománite
Na
 
2
CaPb
 
3
[CO
 
3
]
 
5
Related Minerals - Hey's Index Grouping:
11.1.1Zabuyelite
Li
 
2
CO
 
3
11.1.2Natrite
Na
 
2
CO
 
3
11.1.3Nahcolite
NaHCO
 
3
11.1.4Wegscheiderite
Na
 
5
H
 
3
(CO
 
3
)
 
4
11.1.5Thermonatrite
Na
 
2
CO
 
3
·H
 
2
O
11.1.6Trona
Na
 
3
H(CO
 
3
)
 
2
·2H
 
2
O
11.1.7Natron
Na
 
2
CO
 
3
·10H
 
2
O
11.1.8Kalicinite
KHCO
 
3
11.1.9Shortite
Na
 
2
Ca
 
2
(CO
 
3
)
 
3
11.1.10Nyerereite
Na
 
2
Ca(CO
 
3
)
 
2
11.1.11Natrofairchildite
11.1.13Pirssonite
Na
 
2
Ca(CO
 
3
)
 
2
·2H
 
2
O
11.1.14Gaylussite
Na
 
2
Ca(CO
 
3
)
 
2
·5H
 
2
O
11.1.15Baylissite
K
 
2
Mg(CO
 
3
)
 
2
·4H
 
2
O
11.1.16Fairchildite
K
 
2
Ca(CO
 
3
)
 
2
11.1.17Bütschliite
K
 
2
Ca(CO
 
3
)
 
2
11.1.18Teschemacherite
(NH
 
4
)HCO
 
3

Other Names for Zemkorite

Synonyms:
IMA1985-041
German names:
Zemkorit
Spanish names:
Zemkorita

Other Information

Health Warning: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:Doklady Akademii Nauk SSSR (1988): 301: 188-193.

American Mineralogist (1990): 75: 933-934.

American Mineralogist (2002): 87: 1384.

Internet Links for Zemkorite

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  • Raman and XRD data at RRUFF project
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    Localities for Zemkorite

    (TL) indicates type locality. ? 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
     
    • Eastern-Siberian Region
      • Saha Republic (Sakha Republic; Yakutia)
        • Daldyn-Alakit kimberlite field
          • Daldyn
    		M. Kamenetsky et al. , Geophysical Research Abstracts, Vol. 5, 2003.
    Mineral and/or Locality
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