Mineralogy Database

Zemkorite Mineral Data

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General Zemkorite Information

Help on Chemical  Formula: Chemical Formula: (Na,K)2Ca(CO3)2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na1.8K0.3Ca1.1(CO3)2
Help on Environment: Environment: Fracture fillings in unaltered diamondiferous kimberlite found in drill cores.
Help on IMA Status: IMA Status: Approved IMA 1988
Help on Locality: Locality: Udachnaya pipe, Daldyn kimberlite field, Yakutiya, Russia. Link to MinDat.org Location Data.
Help on Name Origin: 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.
Help on Name Pronunciation: Name Pronunciation: Zemkorite + Pronunciation Say ZEMKORITE

Zemkorite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.26441
Help on Cell Dimensions: Cell Dimensions: a = 10.06, c = 12.72, Z = 8; V = 1,114.84 Den(Calc)= 2.59
Help on Crystal System: Crystal System: Hexagonal Space Group: P 63/mmc, P 63mc, P 62c-
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Colorless.
Help on Density: Density: 2.46
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Fan Shaped - Occurs as radiating crystals shaped like a fan.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Zemkorite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (-), e=1.513, w=1.535, bire=0.0220.

Calculated Properties of Zemkorite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.56 gm/cc
note: Specific Gravity of Zemkorite =2.59 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0017091047
Boson Index = 0.9982908953
Help on Photoelectric: Photoelectric: PEZemkorite = 3.48 barns/electron
U=PEZemkorite x relectron= 8.91 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (14)Anhydrous Carbonates
  (14.03)with Compound Formula A+2 B++ (CO3)2
  (14.03.03)Fairchildite Series Fairchildite K2Ca(CO3)2 P 63/mmc 6/m 2/m 2/m Zemkorite (Na,K)2Ca(CO3)2 P 63/mmc, P 63mc, P 62c- Hex
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Am.Min.,Vol.75,p933,1990)
Help on See Also: 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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Dana No: Strunz No: 05.AC.10





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