Zemkorite Mineral Data

Zemkorite Mineral Data +

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.

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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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Zemkorite

Electron Density:

r_electron=2.56 gm/cc
note: r_Zemkorite=2.59 gm/cc.

Fermion Index

Fermion Index = 0.0017
Boson Index = 0.9983

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)

Estimated Radioactivity from Zemkorite - barely detectable

Zemkorite Classification

Dana Class:

14.3.3.2 (14)Anhydrous Carbonates

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

(14.3.3)Dana Group

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

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

Strunz Class:

V/B.05-55 V - Nitrates, Carbonates and Borates

V/B - Waterfree carbonates [CO3]2- without unfamiliar anions

V/B.05 - Eitelie - Shortite - Carbocernaite series

V/B.05-10 Eitelite Na2Mg(CO3)2 R 3 3

V/B.05-20 Nyerereite Na2Ca(CO3)2 C mc2₁ mm2

V/B.05-30 Natrofairchildite Na2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

V/B.05-40 Gregoryite (Na2,K2,Ca)CO3 P 6₃mc 6mm

V/B.05-50 Fairchildite K2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

V/B.05-55 Zemkorite (Na,K)2Ca(CO3)2 P 6₃/mmc, P 6₃mc, P 6₂c- Hex

V/B.05-60 Butschliite K2Ca(CO3)2 R 3m 3 2/m

V/B.05-70 Shortite Na2Ca2(CO3)3 Amm2 mm2

V/B.05-80 Sahamalite-(Ce) (Mg,Fe)Ce2(CO3)4 P 2₁/a 2/m

V/B.05-90 Remondite-(Ce) Na3(Ce,La,Ca,Na,Sr)3(CO3)5 P 2₁ 2

V/B.05-92 Remondite-(La)! Na3(La,Ce,Ca)3(CO3)5 P 2₁ 2

V/B.05-95 Petersenite-(Ce) (Na,Ca)4(Ce,La,Nd)2(CO3)5 P 2₁ 2

V/B.05-98 Calcioburbankite Na3(Ca,REE,Sr)3(CO3)5 P 6₃mc 6mm

V/B.05-100 Burbankite (Na,Ca)3(Sr,Ba,Ce)3(CO3)5 P 6₃/mmc 6/m 2/m 2/m

V/B.05-110 Khanneshite (NaCa)3(Ba,Sr,Ce,Ca)3(CO3)5 P 6₃mc 6mm

V/B.05-120 Carbocernaite (Ca,Na)(Sr,Ce,Ba)(CO3)2 P mc2₁ mm2

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Zemkorite

(Na,K)2Ca(CO3)2
Dana No: 14.3.3.2 Strunz No: V/B.05-55
Locality:

Notes: