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Khomyakovite (Khomyakovit)

Collectors Summary

Hardness (Mohs) 5.5
Cleavages keine
Fracture uneben
Crystal System trigonal, R3m

Chemism

Chemical formula

Na12Sr3Ca6(Fe2+Mn2+)3Zr3(W,Nb)[(OH,Cl)|Si0.5(O,OH)2|Si3O9|Si9O27]2

Chemical composition

Calcium, Chlor, Eisen, Mangan, Natrium, Niob, Silicium, Strontium, Zirconium, Sauerstoff, Wasserstoff, Wolfram

Unit weight: 3508.6808801 u; Number of atoms in the formula: 136.5

Info

Empirical formula:

Na12Sr3Ca6(FeMn)3Zr3(W0.75Nb0.25)[((OH)0.75Cl0.25)Si0.5(O0.75(OH)0.25)2Si3O9Si9O27]2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.07

2.5

1.83

1.0079470

2.5198675
Oxygen

O

35.34

77.5

56.78

15.9994300

1,239.9558250
Sodium

Na

7.86

12

8.79

22.9897702

275.8772424
Silicon

Si

20.01

25

18.32

28.0855300

702.1382500
Chlorine

Cl

0.51

0.5

0.37

35.4532000

17.7266000
Calcium

Ca

6.85

6

4.40

40.0784000

240.4704000
Manganese

Mn

4.70

3

2.20

54.9380499

164.8141497
Iron

Fe

4.77

3

2.20

55.8452000

167.5356000
Strontium

Sr

7.49

3

2.20

87.6210000

262.8630000
Zirconium

Zr

7.80

3

2.20

91.2242000

273.6726000
Niobium

Nb

0.66

0.25

0.18

92.9063820

23.2265955
Tungsten

W

3.93

0.75

0.55

183.8410000

137.8807500

Analysis wt%

SiO2 : 43.70, WO3 : 3.80, Nb2O5 : 1.33, ZrO2 : 10.62, FeO : 4.33, MnO : 1.63, CaO : 10.42, SrO : 8.45, Na2O : 11.35, K2O : 0.52, Cl : 0.67, H2O : 0.87 (Ref: Canadian Mineralogist 99)

Strunz 9th edition incl. updates

9.CO.10

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
O: ~[Si9O27]18- neuner-Ringe
10:Eudialyt-Gruppe

Lapis Classification

VIII/E.25-060

VIII: SILIKATE
E: Ringsilikate
25: Neunerringe + Dreierringe; Eudialyt-Gruppe

Classification by Hölzel

9.CG.170

9: SILICATES
C: Cyclosilicates
G: ~[Si3O9]6-- + ~[Si9O27]18--Rings Eudialyte-Group
1: Eudialyte-Group - c=30, Fe- Series

Dana 8th edition

64.01.01.04

64: Cyclosilicates Cyclosilicates
01: Cyclosilicates Cyclosilicates Cyclosilicate Rings with Other Anions and Insular Silicate Groups with mixed ring types
01: Eudialyte Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Eudialyte group

Optical Properties

max. Birefringence

0.003
Birefringence chart\! Khomyakovite title=Birefringence chart Khomyakovite

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

1.628

RI value γ / ε

1.625

Ri mean

1.627

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

160

Space Group

R3m

Cell parameters a (Å)

14.296

Cell parameters b (Å)

-

Cell parameters c (Å)

30.084

Cell parameters a/b or c/a

2.104

Cell parameters c/b

-

Z

3

Volumne (ų)

5324.702

X-Ray Powder Diffraction

11.50(90),
9.53(70),
6.450(50),
6.070(50),
5.735(50),
3.406(50),
2.980(100),
2.856(80)
XRD chart Khomyakovite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.5

VHN (Hardness Vickers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.14 (berechnet)

3.282 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

uneben

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Kanada/Québec/Montérégie, Region/La Vallée-du-Richelieu RCM/Mont Saint-Hilaire/Poudrette Quarry (Demix Quarry; Uni-Mix Quarry; Desourdy Quarry)

Preface

Author (Name, Year)

Johnsen & Gault & Grice & Ercit, 1999

References

Canadian Mineralogist 37 (1999), 893

IMA group assignments

Other languages

German

Khomyakovit

Spanish

Khomyakovita

French

Khomyakovite

English

Khomyakovite

Russian

Хомяковит

CNMNC (IMA)-Number

IMA 1998-042

CNMNC symbol

Symbol

Kmy

Locations with GPS information