Zemkorite
A valid IMA mineral species
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Formula:
Na2Ca(CO3)2
Colour:
Colourless
Lustre:
Vitreous, Pearly
Hardness:
2
Specific Gravity:
2.46
Crystal System:
Hexagonal
Name:
Named after the acronym for the Russian "Zemnoy Kory", the Institute of Earth's Crust, Academy of Science, Siberian Branch, Novosibirsk (Russia).
Type Locality:
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)'.
There are a few synthetic HP chemically close compounds, e.g., 'Unnamed (Na-Ca Carbonate I)'.
Unique Identifiers
Mindat ID:
4393
Long-form identifier:
mindat:1:1:4393:5
GUID
(UUID V4):
(UUID V4):
9f9dce90-344a-4551-bfc2-f6ea7586e002
IMA Classification of Zemkorite
Approved
Approval year:
1985
First published:
1988
Classification of Zemkorite
5.AC.10
5 : CARBONATES (NITRATES)
A : Carbonates without additional anions, without H2O
C : Alkali and alkali-earth carbonates
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
14 : ANHYDROUS NORMAL CARBONATES
3 : A2B(XO3)2
11.1.12
11 : Carbonates
1 : Carbonates of the alkali metals and ammonium
11 : Carbonates
1 : Carbonates of the alkali metals and ammonium
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Zmk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Zemkorite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Zemkorite
Vitreous, Pearly
Transparency:
Transparent
Colour:
Colourless
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
lamellar
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.
and does not take into account mineral colouration.
Surface Relief:
Low
Chemistry of Zemkorite
Mindat Formula:
Na2Ca(CO3)2
Elements listed:
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 V:
1,114.84 ų (Calculated from Unit Cell)
Z:
8
Comment:
Space group P63/mmc, P-62c or P63mc
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.36 Å | (100) |
| 3.04 Å | (100) |
| 2.52 Å | (100) |
| 2.06 Å | (100) |
| 6.36 Å | (90) |
| 1.797 Å | (80) |
| 2.18 Å | (70) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 8 : Mafic igneous rocks |
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
Associated Minerals at Type Locality:
Reference:
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.
Synonyms of Zemkorite
Other Language Names for Zemkorite
Related Minerals - Strunz-mindat Grouping
| 5.AC.05 | Eitelite | Na2Mg(CO3)2 |
| 5.AC.10 | Nyerereite | Na2Ca(CO3)2 |
| 5.AC.15 | Bütschliite | K2Ca(CO3)2 |
| 5.AC.20 | Fairchildite | K2Ca(CO3)2 |
| 5.AC.25 | Shortite | Na2Ca2(CO3)3 |
| 5.AC.30 | Burbankite | (Na,Ca)3(Sr,Ba,Ce)3(CO3)5 |
| 5.AC.30 | Calcioburbankite | Na3(Ca,REE,Sr)3(CO3)5 |
| 5.AC.30 | Khanneshite | (Na,Ca)3(Ba,Sr,Ce,Ca)3(CO3)5 |
| 5.AC.30 | Sanrománite | Na2CaPb3[CO3]5 |
| 5.AC.30 | Lishiite | (Ca2◻)Sr3(CO3)5 |
Other Information
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.
Internet Links for Zemkorite
mindat.org URL:
https://www.mindat.org/min-4393.html
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Please feel free to link to this page.
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References for Zemkorite
Localities for Zemkorite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Canada | |
| Kamenetsky et al. (2013) |
| Abersteiner et al. (2018) | |
| Shang (2000) |
India | |
| Parthasarathy et al. (2002) |
Russia (TL) | |
| M. Kamenetsky et al. +2 other references |
South Africa | |
| Kamenetsky et al. (2014) |
| Giuliani et al. (2012) +1 other reference |
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