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Potassic-magnesio-fluoro-arfvedsonite

Additional Functions

Collectors Summary

Color blauschwarz bis purpurblau, bläulich grau
Streak color weiß
Cleavages vollkommen
Fracture splittrig
Crystal System monoklin, C/2m

Chemism

Chem­ical formula

KNa2(Mg,Fe2+)5[(F,OH)|Si4O11]2

Chem­ical com­po­si­tion

Eisen, Magnesium, Natrium, Silicium, Fluor, Kalium, Sauerstoff, Wasserstoff

Unit weight: 859.701318775 u; Number of atoms in the formula: 40.5

Info

Empirical formula:

KNa2(Mg0.75Fe0.25)5[(F0.75(OH)0.25)Si4O11]2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.06

0.5

1.23

1.0079470

0.5039735

Oxygen

O

41.87

22.5

55.56

15.9994300

359.9871750

Fluorine

F

3.31

1.5

3.70

18.9984033

28.4976049

Sodium

Na

5.35

2

4.94

22.9897702

45.9795404

Magnesium

Mg

10.60

3.75

9.26

24.3050600

91.1439750

Silicon

Si

26.14

8

19.75

28.0855300

224.6842400

Potassium

K

4.55

1

2.47

39.0983100

39.0983100

Iron

Fe

8.12

1.25

3.09

55.8452000

69.8065000

Anal­y­sis wt%

SiO2 : 54.80, Fe2O3 : 9.84, FeO : 2.61, MgO : 17.44, CaO : 2.37, Na2O : 6.37, K2O : 3.44, F : 2.33, H2O : 0.94 (Ref: Canadian Mineralogist 1987)

Strunz 9th edi­tion incl. updates

9.DE.25

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
E: Ketten- und Bandsilikate mit 2-periodischen Doppelketten, Si4O11; Amphibol-Familie, Klinoamphibole
25:Amphibole: Alkali

Lapis Clas­sifica­tion

VIII/F.08-156

VIII: SILIKATE
F: Ketten- und Bandsilikate
8: Zweierbänder [Si4O11] 6-; Amphibol-Gruppe; Alkali-Amphibole

Clas­sifica­tion by Hölzel

9.DJ.406

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
J: Amphiboles; Sodic Amphiboles
4: Arfvedsonite-Group

IMA sta­tus

anerkannt 1985

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Classification

Amphibole supergroup  ⇒ (OH,F,Cl)-dominant amphiboles  ⇒ Sodium Amphiboles  ⇒ Arfvedsonite (Arf) amphiboles

Optical Properties

Color

blauschwarz bis purpurblau, bläulich grau

Streak color

weiß

max. Birefrin­gence

0.011

Birefringence chart\! Potassic-magnesio-fluoro-arfvedsonite title=Birefringence chart Potassic-magnesio-fluoro-arfvedsonite

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

1.631

RI value β

1.638

RI value γ / ε

1.642

Ri mean

1.637

2V angle

Biaxial (-) 71°

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C/2m

Cell param­e­ters a (Å)

9.906

Cell param­e­ters b (Å)

17.953

Cell param­e­ters c (Å)

5.287

Cell param­e­ters a/b or c/a

0.552

Cell param­e­ters c/b

0.294

Cell param­e­ters α

90°

Cell param­e­ters β

104.30

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

911.12

X-Ray Pow­der Diffrac­tion

8.49(60),
4.49(10),
3.393(10),
3.279(30),
3.151(100),
2.822(20),
2.707(20),
2.165(10)

XRD chart Potassic-magnesio-fluoro-arfvedsonite

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

Crystal Structure 3D

Open larger view

Physical Properties

VHN (Hard­ness Vick­ers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.14 (gemessen)

3.133 ( ρ calc. Mineralienatlas )

Cleav­ages

vollkommen

Frac­ture

splittrig

Tenac­ity

spröde

Preface

Author (Name, Year)

Hogarth & Chao & Townsend, 1987

References

Donald D. Hogarth, George Y. Chao, Michael G. Townsend: Potassium- and fluorine-rich amphiboles from the Gatineau area, Quebec. Canadian Mineralogist 25 (1987) S.739-753.

Frank K. Mazdab: THE DIVERSITY AND OCCURRENCE OF POTASSIUM-DOMINANT AMPHIBOLES. Canadian Mineralogist 41 (2003) S.1329-1344.

American Mineralogist 90 (2005) S.516.

Hogarth, D.D.: Fluoro-potassic-magnesio-arfvedsonite, KNa2Mg5Si8O22F2, from the Outaouais Region, Québec, Canada. Canadian Mineralogist 44 (2006) S. 289-289. Erratum dazu: Canadian Mineralogist 48 (2010) S.432.

Hawthorne, Frank C., and Roberta Oberti: Über die Klassifikation der Amphibole: Canadian Mineralogist 44(1) (2006) S.1-21.

Frank C. Hawthorne, Roberta Oberti, George E. Harlow, Walter V. Maresch, Robert F. Martin, John C. Schumacer, Mark D. Welch (2012): Nomenclature of the amphibole supergroup, American Mineralogist, Volume 97, pages 2031–2048

IMA group assignments



 
 
 
 
 
 


 
 
 
 
 
Na3(Fe2+,Mg)4Fe3+Si8O22(OH)2
monoklin
C2/m

 
 
 
 
 
Na3(Mg,Fe2+)4Fe3+Si8O22(OH)2
monoklin
C2/m

 
 
 
 
 
(Na,K)Na2(Mg,Fe2+)4Fe3+[(F,OH)|Si4O11]2
monoklin
C2/m

 
 
 
 
 
KNa2Fe2+4Fe3+Si8O22(OH)2
monoklin
C2/m

 
 
 
 
 
[K][Na2][Mg4Fe3+][(OH)2|Si8O22]
monoklin
C2/m

 
 
 
 
 
KNa2(Mg,Fe2+)5[(F,OH)|Si4O11]2
monoklin
C/2m

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Actuality: 11. Aug 2022 - 07:26:32

Other languages

German

Kalium-Magnesio-Fluoro-Arfvedsonit

English

Potassic-magnesio-fluoro-arfvedsonite

Alternative Name

German

Fluor-Kalium-Magnesio-Arfvedsonit

Fluor-Kalium-Magnesium-Arfvedsonit

Fluoro-Kalium-Magnesioarfvedsonit

English

Fluoro-potassic-magnesio-arfvedsonite

English

Fluoropotassicmagnesioarfvedsonite

CNMNC (IMA)-Number

IMA 1985-023

CNMNC symbol

Symbol

Pmfarf

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