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Kumtyubeite (Kumtyubeit)

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.

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Alleghanyite

Mn5(SiO4)2(OH)2

monoklin : 2/m : P21/a

9.AF.45

Chondrodite

(Mg,Fe2+)5(SiO4)2(F,OH)2

monoklin : 2/m : P21/a

9.AF.45

Hydroxylchondrodite

Mg5(SiO4)2(OH)2

monoklin : 2/m : P21/c

9.AF.45

Kumtyubeite

Ca5(SiO4)2F2

monoklin : 2/m : P21/a

9.AF.45

Reinhardbraunsite

Ca5(SiO4)2(OH,F)2

monoklin : 2/m : P21/a

9.AF.45

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Norbergite

Mg3(SiO4)(F,OH)2

orthorhombisch : mmm : Pnam

VIII/B.04-010

Chondrodite

(Mg,Fe2+)5(SiO4)2(F,OH)2

monoklin : 2/m : P21/a

VIII/B.04-020

Hydroxylchondrodite

Mg5(SiO4)2(OH)2

monoklin : 2/m : P21/c

VIII/B.04-022

Humite

(Mg,Fe2+)7(SiO4)3(F,OH)2

orthorhombisch : mmm : Pbnm

VIII/B.04-030

Clinohumite

(Mg,Fe2+)9(SiO4)4(F,OH)2

monoklin : 2/m : P21/a

VIII/B.04-040

Hydroxylclinohumite

Mg9[(OH,F)2|(SiO4)4]

monoklin : 2/m : P21/a

VIII/B.04-042

Ribbeite

(Mn2+,Mg)5(SiO4)2(OH)2

orthorhombisch : mmm : Pnam

VIII/B.04-050

Alleghanyite

Mn5(SiO4)2(OH)2

monoklin : 2/m : P21/a

VIII/B.04-060

Kumtyubeite

Ca5(SiO4)2F2

monoklin : 2/m : P21/a

VIII/B.04-068

Reinhardbraunsite

Ca5(SiO4)2(OH,F)2

monoklin : 2/m : P21/a

VIII/B.04-070

Manganhumite

(Mn,Mg)7(SiO4)3(OH)2

orthorhombisch : mmm : Pbnm

VIII/B.04-080

Leucophoenicite

Mn7(SiO4)3(OH)2

monoklin : 2/m : P21/a

VIII/B.04-090

Chegemite

Ca7(SiO4)3(OH)2

orthorhombisch : mmm : Pbnm

VIII/B.04-095

Jerrygibbsite

Mn9(SiO4)4(OH)2

orthorhombisch : mm2 : Pbn21

VIII/B.04-100

Sonolite

Mn9(SiO4)4(OH,F)2

monoklin : 2/m : P21/a

VIII/B.04-110

Edgrewite

Ca9(SiO4)4F2

monoklin : 2/m : P21/b

VIII/B.04-120

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Chondrodite

(Mg,Fe2+)5(SiO4)2(F,OH)2

monoklin : 2/m : P21/a

9.AI.310

Hydroxylchondrodite

Mg5(SiO4)2(OH)2

monoklin : 2/m : P21/c

9.AI.315

Alleghanyite

Mn5(SiO4)2(OH)2

monoklin : 2/m : P21/a

9.AI.320

Reinhardbraunsite

Ca5(SiO4)2(OH,F)2

monoklin : 2/m : P21/a

9.AI.330

Kumtyubeite

Ca5(SiO4)2F2

monoklin : 2/m : P21/a

9.AI.335

Leucophoenicite

Mn7(SiO4)3(OH)2

monoklin : 2/m : P21/a

9.AI.350

Clinohumite

(Mg,Fe2+)9(SiO4)4(F,OH)2

monoklin : 2/m : P21/a

9.AI.360

Hydroxylclinohumite

Mg9[(OH,F)2|(SiO4)4]

monoklin : 2/m : P21/a

9.AI.370

'Titanclinohumite ' (Var.v. Clinohumite)

9.AI.375

Sonolite

Mn9(SiO4)4(OH,F)2

monoklin : 2/m : P21/a

9.AI.380

Other languages

German

Kumtyubeit

Spanish

Kumtyubeita

English

Kumtyubeite

Russian

Кумтюбеит

IMA Number

IMA 2008-045

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

German pages

DeWikiPedia - search for: Kumtyubeit
Google-Bilder-Suche - search for: Kumtyubeit
Mineralogisch-Petrographisches-Institut Hamburg - 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
Athena - search for: Kumtyubeite

Russian pages

Webmineral.ru - search for: Кумтюбеит

Mineral Dealer

German pages

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Crystal-Treasure.com - search for: Kumtyubeit
Bosse - search for: Kumtyubeit

Locations with GPS information




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