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Kumtyubeite (Kumtyubeit)

Pictures (1 Images total)

Kumtyubeit
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Kumtyubeit
farblose Aggregate von Kumtyubeit, Lakargi Mt., Chegem Caldera, Nordkaukasus, Russland; BB ~ 2 cm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Russland/Nordkaukasus, Föderationskreis/Kabardino-Balkarien, Republik/Obere vulkanische Chegem-Struktur (Verkhnechegemskaya Caldera)/Lakargi-Gebirge
Mineral: Kumtyubeite
Image: 1636315937
License: Usage for Mineralienatlas project only
Kumtyubeit

farblose Aggregate von Kumtyubeit, Lakargi Mt., Chegem Caldera, Nordkaukasus, Russland; BB 2 cm, analysiert
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2021-11-07
Locality: Lakargi-Gebirge / Obere vulkanische Chegem-Struktur (Verkhnechegemskaya Caldera) / Kabardino-Balkarien, Republik / Nordkaukasus, Föderationskreis / Russland

Collectors Summary

Color leicht rosa
Lustre Glasglanz
Hardness (Mohs) 4.5
Cleavages deutlich (001)
Crystal System monoklin, P21/a

Chemism

Chemical formula

Ca5(SiO4)2F2

Additional chem. information

Fluor-dominantes Gegestück von Reinhardbraunsit

Chemical composition

Calcium, Silicium, Fluor, Sauerstoff

Unit weight: 422.5553065 u; Number of atoms in the formula: 17

Info

Empirical formula:

Ca5(SiO4)2F2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

30.29

8

47.06

15.9994300

127.9954400
Fluorine

F

8.99

2

11.76

18.9984033

37.9968065
Silicon

Si

13.29

2

11.76

28.0855300

56.1710600
Calcium

Ca

47.42

5

29.41

40.0784000

200.3920000

Analysis wt%

SiO2 : 28.20, CaO : 66.19, F : 6.22, H2O : 1.25 (Ref: American Mineralogist 2009)

Strunz 9th edition incl. updates

9.AF.45

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
F: Insel(Neso)silikate mit zusätzlichem Anionen; Kationen in [4], [5] und/oder nur [6] Koordination
45:Chondrodit-Gruppe

Lapis Classification

VIII/B.04-068

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
4: Kationen in tetraedrischer oder oktaedrischer Koordination [4/6]; Humit-Gruppe

Classification by Hölzel

9.AI.335

9: SILICATES
A: Nesosilicates
I: Nesosilicates with OH
3: Chondrodite-Group

IMA status

anerkannt, IMA WEB-Seite - Neue Mineralien Dez. 2008.

Mineral status

anerkanntes Mineral

Optical Properties

Color

leicht rosa

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.014
Birefringence chart\! Kumtyubeite title=Birefringence chart Kumtyubeite

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

1.594

RI value β

1.605

RI value γ / ε

1.608

Ri mean

1.602

2V angle

Biaxial (-) 48°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/a

Cell parameters a (Å)

11.446

Cell parameters b (Å)

5.051

Cell parameters c (Å)

8.852

Cell parameters a/b or c/a

2.266

Cell parameters c/b

1.753

Cell parameters α

90°

Cell parameters β

108.87

Cell parameters γ

90°

Z

2

Volumne (ų)

484.262

X-Ray Powder Diffraction

5.422(38), 3.327(45), 3.034(62), 2.941(35), 2.773(33), 1.904(100), 1.895(46), 1.659(63)
XRD chart Kumtyubeite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4.5

VHN (Hardness Vickers)

300 (50g)

Density (g/cm³)

2.866 (berechnet)

2.898 ( ρ calc. Mineralienatlas )

Cleavages

deutlich (001)

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Russland/Nordkaukasus, Föderationskreis/Kabardino-Balkarien, Republik/Obere vulkanische Chegem-Struktur (Verkhnechegemskaya Caldera)/Lakargi-Gebirge

Paragenesis of type material

Spurrit, Magnesioferrit

Preface

Author (Name, Year)

Irena O. Galuskina, 2008

References

IMA WEB-Seite - Neue Mineralien Dez. 2008.

Irina О. Galuskina, Biljana Lazic, Thomas Armbruster, Evgeny V. Galuskin, Viktor M. Gazeev, Aleksander E. Zadov, Nikolai N. Pertsev, Lidia Jeżak, Roman Wrzalik, and Anatoly G. Gurbanov (2009): Kumtyubeite Ca5(SiO4)2F2 — A new calcium mineral of the humite group from Northern Caucasus, Kabardino-Balkaria, Russia. American Mineralogist, 94, 1361–1370.

Other languages

German

Kumtyubeit

Spanish

Kumtyubeita

English

Kumtyubeite

Russian

Кумтюбеит

CNMNC (IMA)-Number

IMA 2008-045

CNMNC symbol

Symbol

Kty

Locations with GPS information