Zemkorite Mineral Data

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General Zemkorite Information

Chemical Formula:

(Na,K)2Ca(CO3)2

Composition:

Molecular Weight = 217.22 gm

Potassium 5.40 % K 6.50 % K₂O

Sodium 19.05 % Na 25.68 % Na₂O

Calcium 20.30 % Ca 28.40 % CaO

Carbon 11.06 % C 40.52 % CO₂

Oxygen 44.19 % O

______ ______

100.00 % 101.10 % = TOTAL OXIDE

Empirical Formula:

Na_1.8K_0.3Ca_1.1(CO₃)₂

Environment:

Fracture fillings in unaltered diamondiferous kimberlite found in drill cores.

IMA Status:

Approved IMA 1988

Locality:

Udachnaya pipe, Daldyn kimberlite field, Yakutiya, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the Institute of the Earth's Crust (Russian: zemnoy kory = "earth's crust"), Russian Academy of Science, Siberian Branch where the mineral was first studied.

Name Pronunciation:

Zemkorite + Pronunciation

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Zemkorite Crystallography

Axial Ratios:

a:c = 1:1.26441

Cell Dimensions:

a = 10.06, c = 12.72, Z = 8; V = 1,114.84 Den(Calc)= 2.59

Crystal System:

HexagonalSpace Group: P 6₃/mmc, P 6₃mc, P 6₂c-

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.06(1)(402,106), 4.36(1)(200), 3.04(1)(203),2.52(1)(220), 6.36(0.9)(002), 1.797(0.8)(404), 2.18(0.7)(400), 3.18(0.6)(004,211),

Physical Properties of Zemkorite

Cleavage:

{???} Perfect

Color:

Colorless.

Density:

2.46

Diaphaneity:

Transparent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Fan Shaped - Occurs as radiating crystals shaped like a fan.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2 - Gypsum

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Zemkorite

Gladstone-Dale:

CI meas= -0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2023,KPDmeas= 0.213,KC= 0.2067
Ncalc = 1.51 - 1.54

Optical Data:

Uniaxial (-), e=1.513, w=1.535, bire=0.0220.

Calculated Properties of Zemkorite

Electron Density:

Bulk Density (Electron Density)=2.56 gm/cc
note: Specific Gravity of Zemkorite =2.59 gm/cc.

Fermion Index:

Fermion Index = 0.0017091047
Boson Index = 0.9982908953

Photoelectric:

PE_Zemkorite= 3.48 barns/electron
U=PE_Zemkorite x r_electron= 8.91 barns/cc.

Radioactivity:

GRapi = 77.11 (Gamma Ray American Petroleum Institute Units)
Concentration of Zemkorite per GRapi unit = 1.30 (%)

Estimated Radioactivity from Zemkorite - barely detectable

Zemkorite Classification

Dana Class:

14.03.03.02 (14)Anhydrous Carbonates

(14.03)with Compound Formula A+2 B++ (CO3)2

(14.03.03)Fairchildite Series

14.03.03.01 Fairchildite K2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

14.03.03.02 Zemkorite (Na,K)2Ca(CO3)2 P 6₃/mmc, P 6₃mc, P 6₂c- Hex

Strunz Class:

05.AC.10 05 - CARBONATES (NITRATES)

05.A - Carbonates without additional anions, without H2O

05.AC -Alkali and alkali-earth carbonates

05.AC.10 Nyerereite Na2Ca(CO3)2 C mc2₁ mm2

05.AC.10 Natrofairchildite Na2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

05.AC.10 Zemkorite (Na,K)2Ca(CO3)2 P 6₃/mmc, P 6₃mc, P 6₂c- Hex

Other Zemkorite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Am.Min.,Vol.75,p933,1990)

See Also:

Links to other databases for Zemkorite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Zemkorite Specimen Label here :

Zemkorite

(Na,K)2Ca(CO3)2
Dana No: 14.03.03.02 Strunz No: 05.AC.10
Locality:

Notes: