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Kumtyubeite

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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 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

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

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

German pages

DeWikiPedia - search for: Kumtyubeit
Google-Bilder-Suche - search for: Kumtyubeit
Mineralienatlas.de (Forum) - search for: Kumtyubeit

English pages

Mindat - search for: Kumtyubeite
Webmineral - search for:Kumtyubeite
Handbook-of-Mineralogy - search for: Kumtyubeite
RRUFF - Raman, XRD and other mineral data - search for: Kumtyubeite
RRUFF - References and PDF downloads - search for: Kumtyubeite
American-Mineralogist-Crystal-Structure-Database - search for: Kumtyubeite
Strahlen.org - search for: Kumtyubeite

Russian pages

Webmineral.ru - search for: Кумтюбеит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Kumtyubeit
Crystal-Treasure.com - search for: Kumtyubeit
Bosse - search for: Kumtyubeit
Edelsteine Neuburg - Gundolf Fischer - search for: Kumtyubeit

Locations with GPS information