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Karchevskyite

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Karchevskyit
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Karchevskyit
taflige Kristalle von Karchevskyit, Kovdor, Kola, Russland; BB < 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Kovdor
Mineral: Karchevskyite
Image: 1581182851
License: Usage for Mineralienatlas project only
Karchevskyit

taflige Kristalle von Karchevskyit, Kovdor, Kola, Russland; BB < 1 mm, analysiert

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-02-08
Locality: Kovdor / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color farblos bis weiß
Lustre Glasglanz mit Perlmuttglanz auf Spaltflächen
Hardness (Mohs) 2
Cleavages perfekt nach {001}
Solubility langsam in 10% HCl unter schwachem Aufbrausen
Crystal System trigonal,
Morphology Bildet bis zu 1,5mm Durchmesser kugelige Aggregate, aus dünnblätterigen bis plättchenförmigen Kristallen.

Chemism

Chemical formula

[Mg18Al9(OH)54][Sr2(CO3,PO4)9(H2O,H3O)11]

Chemical composition

Aluminium, Magnesium, Strontium, Kohlenstoff, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 2593.65275525 u; Number of atoms in the formula: 211

Info

Empirical formula:

[Mg18Al9(OH)54][Sr2((CO3)0.75(PO4)0.25)9((H2O)0.75(H3O)0.25)11]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

3.06

78.75

37.32

1.0079470

79.3758263

Carbon

C

3.13

6.75

3.20

12.0107800

81.0727650

Oxygen

O

58.14

94.25

44.67

15.9994300

1,507.9462775

Magnesium

Mg

16.87

18

8.53

24.3050600

437.4910800

Aluminium

Al

9.36

9

4.27

26.9815382

242.8338438

Phosphorus

P

2.69

2.25

1.07

30.9737612

69.6909627

Strontium

Sr

6.76

2

0.95

87.6210000

175.2420000

Analysis wt%

P2O5 : 1.30, CO2 : 14.50, Al2O3 : 18.30, MgO : 29.70, SrO : 7.40, H2O : 28.60 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 2007)

Strunz 9th edition incl. updates

4.

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)

Lapis Classification

V/E.03-090

V: NITRATE, CARBONATE UND BORATE
E: Wasserhaltige Carbonate, mit fremden Anionen
3: Hydrotalkit-Gruppe

Classification by Hölzel

5.DE.130

5: CARBONATES NITRATES ARSENITES SULFITES SELENITES TELLURITES IODATES
D: Carbonates (+Anions +Water)
E: With other complex Anions

IMA status

anerkannt 2005

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Hydrotalcite Supergroup  ⇒ Wermlandit-Gruppe

Optical Properties

Color

farblos bis weiß

Lustre

Glasglanz mit Perlmuttglanz auf Spaltflächen

max. Birefringence

0.008

Birefringence chart\! Karchevskyite title=Birefringence chart Karchevskyite

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

1.542

RI value γ / ε

1.534

Ri mean

1.539

2V angle

Uniaxial (-)

Pleochroism

kein

Crystallography

Crystal System

trigonal

Cell parameters a (Å)

16.055

Cell parameters b (Å)

-

Cell parameters c (Å)

25.66

Cell parameters a/b or c/a

1.598

Cell parameters c/b

-

Z

3

Volume (ų)

5728.065

X-Ray Powder Diffraction

8.52(10), 6.41(6), 5.13(3), 4.27(6), 3.665(9), 3.547(9), 3.081(6), 2.513(1)

XRD chart Karchevskyite

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

Morphology

Bildet bis zu 1,5mm Durchmesser kugelige Aggregate, aus dünnblätterigen bis plättchenförmigen Kristallen.

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

2

Density (g/cm³)

2.21 gemessen

2.256 ( ρ calc. Mineralienatlas )

Cleavages

perfekt nach {001}

Instability

langsam in 10% HCl unter schwachem Aufbrausen

Chemical Properties and Tests

In 10% Salzsäure unter schwachem Aufbrausen langsam löslich.

Preface

Name from

Pavel I. Karchevsky (Mineraloge, Russland)

References

Mineralien Welt 05/08, Steffen Jahn, Die neuen Mineralien 2007 - 2008

IMA group assignments

Other languages

German

Karchevskyit

English

Karchevskyite

Russian

Карчевскиит

CNMNC (IMA)-Number

IMA 2005-015a

CNMNC symbol

Symbol

Kcv

IDs

GUSID (Global unique identifier short form) eR0IGnv5aUmAnvcJLw9h0w
GUID (Global unique identifier) 1A081D79-F97B-4969-809E-F7092F0F61D3
Database ID 4416