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Coombsite (Coombsit)

Additional Functions

Collectors Summary

Color braun
Streak color bräunlichgelb
Cleavages keine
Fracture keiner
Crystal System trigonal, R3, R3

Chemism

Chemical formula

K(Mn2+,Fe2+,Mg)13[(OH)7|(Si,Al)3O3|Si6O18]2

Chemical composition

Aluminium, Eisen, Magnesium, Mangan, Silicium, Kalium, Sauerstoff, Wasserstoff

Unit weight: 2130.97084752 u; Number of atoms in the formula: 102

Info

Empirical formula:

K(Mn0.6Fe0.3Mg0.1)13[(OH)7(Si0.75Al0.25)3O3Si6O18]2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.66

14

13.73

1.0079470

14.1112580

Oxygen

O

42.05

56

54.90

15.9994300

895.9680800

Magnesium

Mg

1.48

1.3

1.27

24.3050600

31.5965780

Aluminium

Al

1.90

1.5

1.47

26.9815382

40.4723073

Silicon

Si

21.75

16.5

16.18

28.0855300

463.4112450

Potassium

K

1.83

1

0.98

39.0983100

39.0983100

Manganese

Mn

20.11

7.8

7.65

54.9380499

428.5167892

Iron

Fe

10.22

3.9

3.82

55.8452000

217.7962800

Strunz 9th edition incl. updates

9.EG.35

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
G: Doppelnetze mit sechsfach-Ringen
35:Zussmanit-Gruppe

Lapis Classification

VIII/H.40-020

VIII: SILIKATE
H: Schichtsilikate
40: Schichtsilikate mit Tetraeder-Doppelschichten und verwandte Strukturen

Classification by Hölzel

9.EM.360

9: SILICATES
E: Phyllosilicates
M: Serpentine-Group
3: Lizardite-Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

braun

Streak color

bräunlichgelb

max. Birefringence

0.019

Birefringence chart\! Coombsite title=Birefringence chart Coombsite

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

1.619

RI value γ / ε

1.600

Ri mean

1.613

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal, trigonal

Class (H-M)

3, 3

Space Group number

146, 148

Space Group

R3, R3

Cell parameters a (Å)

11.828

Cell parameters b (Å)

-

Cell parameters c (Å)

29.146

Cell parameters a/b or c/a

2.464

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

3

Volumne (ų)

3531.3

X-Ray Powder Diffraction

9.68(100),
4.835(30),
3.241(20),
2.793(70),
2.556(90),
2.241(50),
1.638(20)

XRD chart Coombsite

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

Crystals 3D

Open larger view

Physical Properties

Density (g/cm³)

3.063 (berechnet)

3.006 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

keiner

(Co-)Type locality

(Co-)Type locality

Neuseeland/South Island/Otago, Region/Watsons Beach

Type material

Mineralogische Sammlung, Ruhr-Universität Bochum

Preface

Author (Name, Year)

Sameshima & Kawachi, 1991

References

New Zealand Journal of Geology and Geophysics

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

Coombsite

K(Mn2+,Fe2+,Mg)13[(OH)7|(Si,Al)3O3|Si6O18]2

trigonal : 3, 3 : R3, R3

9.EG.35

Zussmanite

K(Fe2+,Mg,Mn)13(Si,Al)18O42(OH)14

trigonal : 3 : R3

9.EG.35

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

Zussmanite

K(Fe2+,Mg,Mn)13(Si,Al)18O42(OH)14

trigonal : 3 : R3

VIII/H.40-010

Coombsite

K(Mn2+,Fe2+,Mg)13[(OH)7|(Si,Al)3O3|Si6O18]2

trigonal : 3, 3 : R3, R3

VIII/H.40-020

Shafranovskite

Na3K2(Mn,Fe,Na)4[Si9(O,OH)27](OH)2·nH2O

trigonal : 3m : P31m

VIII/H.40-030

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

Lizardite

Mg3Si2O5(OH)4

monoklin : m : Cm

9.EM.300

'Lizardite-1T' (Pol.v. Lizardite)

Mg3Si2O5(OH)4

trigonal : 3m : P31m

9.EM.310

'Lizardite-2H1' (Pol.v. Lizardite)

Mg3Si2O5(OH)4

hexagonal : 6mm : P63cm

9.EM.320

Kellyite

(Mn2+,Mg,Al)3(Si,Al)2O5(OH)4

hexagonal : 6 : P63

9.EM.330

Guidottiite

Mn2Fe3+(SiFe3+)O5(OH)4

hexagonal : 6 : P63

9.EM.340

Zussmanite

K(Fe2+,Mg,Mn)13(Si,Al)18O42(OH)14

trigonal : 3 : R3

9.EM.350

Coombsite

K(Mn2+,Fe2+,Mg)13[(OH)7|(Si,Al)3O3|Si6O18]2

trigonal : 3, 3 : R3, R3

9.EM.360

Other languages

German

Coombsit

Spanish

Coombsita

English

Coombsite

French

Coombsite

Russian

Кумбсит

IMA Number

IMA 1989-058

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

German pages

DeWikiPedia - search for: Coombsit
Google-Bilder-Suche - search for: Coombsit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Coombsit

English pages

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

Russian pages

Webmineral.ru - search for: Кумбсит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Coombsit
Crystal-Treasure.com - search for: Coombsit
Bosse - search for: Coombsit



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