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Zemkorite

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 2
Solubility +++ warmes H2O
Crystal System hexagonal, P63mc, P62c, P63/mmc

Chemism

Chem­ical formula

(Na,K)2Ca(CO3)2

Chem­ical com­po­si­tion

Calcium, Natrium, Kalium, Kohlenstoff, Sauerstoff

Unit weight: 214.1303503 u; Number of atoms in the formula: 11

Info

Empirical formula:

(Na0.75K0.25)2Ca(CO3)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Carbon

C

11.22

2

18.18

12.0107800

24.0215600

Oxygen

O

44.83

6

54.55

15.9994300

95.9965800

Sodium

Na

16.10

1.5

13.64

22.9897702

34.4846553

Potassium

K

9.13

0.5

4.55

39.0983100

19.5491550

Calcium

Ca

18.72

1

9.09

40.0784000

40.0784000

Anal­y­sis wt%

Ø Na2O : 25.72, K2O : 6.41, CaO : 28.39, CO2 : 39.20 (Ref: Doklady Akademiia Nauk, SSSR 88)

Strunz 9th edi­tion incl. updates

5.AC.10

5: Carbonate (Carbonate, Nitrate)
A: Carbonate ohne weitere Anionen, ohne H2O
C: Alkali- und Alkali-Erden-Carbonate
10:Nyerereit-Gruppe

Lapis Clas­sifica­tion

V/B.05-055

V: NITRATE, CARBONATE UND BORATE
B: Wasserfreie Carbonate [CO3] 2-, ohne fremde Anionen

Clas­sifica­tion by Hölzel

5.AB.320

5: CARBONATES NITRATES ARSENITES SULFITES SELENITES TELLURITES IODATES
A: Carbonates (-Anions -Water)
B: Carbonates: hexagonal or trigonal
3: Other Double Carbonates

Dana 8th edi­tion

14.03.03.02

14: Anhydrous Carbonates
03: Anhydrous Carbonates with Compound Formula A+2 B++ (CO3)2
03: Fairchildite Series

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefrin­gence

0.022

Birefringence chart\! Zemkorite title=Birefringence chart Zemkorite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.535

RI value γ / ε

1.513

Ri mean

1.528

2V angle

Uniaxial (-)

Crystallography

Crystal Sys­tem

hexagonal

Class (H-M)

6mm, 6m2, 6/mmm

Space Group number

186, 190, 194

Space Group

P63mc, P62c, P63/mmc

Cell param­e­ters a (Å)

10.06

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

12.72

Cell param­e­ters a/b or c/a

1.264

Cell param­e­ters c/b

-

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

120°

Z

8

Volumne (ų)

1114.843

X-Ray Pow­der Diffrac­tion

6.36(90),
4.36(100),
3.04(100),
2.52(100),
2.18(70),
2.06(100),
1.797(80)

XRD chart Zemkorite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Physical Properties

Hard­ness (Mohs)

2

VHN (Hard­ness Vick­ers)

32 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.46 (gemessen)

2.551 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ warmes H2O

Preface

Author (Name, Year)

Yegorov & Ushchapovskaya & Kashayev & Bogdanov & Sizykh, 1988

References

Doklady Akademiia Nauk, SSSR (USSR) (in Russian) 301 (1988), 188

Other languages

German

Zemkorit

Spanish

Zemkorita

English

Zemkorite

French

Zemkorite

Russian

Земкорит

CNMNC (IMA)-Number

IMA 1985-041

CNMNC symbol

Symbol

Zmk

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

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English pages

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American-Mineralogist-Crystal-Structure-Database - search for: Zemkorite
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Russian pages

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Mineral Dealer

German pages

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