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Potassic-arfvedsonite

Collectors Summary

Color dunkel blaugrün, blaugrau
Streak color blass grünlichblau
Lustre Glasglanz
Hardness (Mohs) 5½ - 6
Cleavages vollkommen (110)
Fracture abgestuft and splittrig
Crystal System monoklin, C2/m
Morphology prismatische bis nadelige xx bis 15 cm Länge, Formen {110} und {001}

Chemism

Chemical formula

KNa2Fe2+4Fe3+Si8O22(OH)2

Additional chem. information

Amphibol Gruppe

Chemical composition

Eisen, Natrium, Silicium, Kalium, Sauerstoff, Wasserstoff

Unit weight: 974.9903044 u; Number of atoms in the formula: 42

Info

Empirical formula:

KNa2Fe4FeSi8O22(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.21

2

4.76

1.0079470

2.0158940

Oxygen

O

39.38

24

57.14

15.9994300

383.9863200

Sodium

Na

4.72

2

4.76

22.9897702

45.9795404

Silicon

Si

23.04

8

19.05

28.0855300

224.6842400

Potassium

K

4.01

1

2.38

39.0983100

39.0983100

Iron

Fe

28.64

5

11.90

55.8452000

279.2260000

Analysis wt%

SiO2 : 48.63, TiO2 : 0.43, Al2O3 : 0.58, Fe2O3 : 11.60, FeO : 24.69, MnO : 1.37, Na2O : 7.01, K2O : 3.29, Li2O : 0.45, F : 0.36 (Ref: Neues Jahrbuch für Mineralogie, (Monatshefte) 2004)

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.08-157

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

Classification by Hölzel

9.DJ.425

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

Dana 8th edition

66.01.03c.09b

66: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2
01: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2 with P=2 amphibole configuration
03c: Group 4, the sodic amphiboles

IMA status

anerkannt 2003

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

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

Optical Properties

Color

dunkel blaugrün, blaugrau

Streak color

blass grünlichblau

Lustre

Glasglanz

max. Birefringence

0.016

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

1.683

RI value β

1.692

RI value γ / ε

1.699

Ri mean

1.691

2V angle

Biaxial (-) 60°

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

10.002

Cell parameters b (Å)

18.054

Cell parameters c (Å)

5.319

Cell parameters a/b or c/a

0.554

Cell parameters c/b

0.295

Cell parameters α

90°

Cell parameters β

103.90

Cell parameters γ

90°

Z

2

Volume (ų)

932.358

X-Ray Powder Diffraction

9.02(28), 8.53(100), 3.419(12), 3.303(23), 3.184(40), 2.847(17), 2.725(10)

XRD chart Potassic-arfvedsonite

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

Morphology

prismatische bis nadelige xx bis 15 cm Länge, Formen {110} und {001}

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5½ - 6

VHN (Hardness Vickers)

630 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.39 (gemessen) 3.43 (berechnet)

3.473 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen (110)

Fracture

abgestuft and splittrig

Tenacity

spröde

Preface

Occurrences

in Alkaligesteins-Pegmatiten

Associations

Analcim, Sodalith, Aegirin, Steenstrupin-(Ce), Epistolit, Ussingit, Vuonnemit, Serandit, Villiaumit, Eudialyt u.a.

Author (Name, Year)

Pekov & Chukanov & Lebedeva & Pushcharovsky & Ferraris & Gula & Zadov

Additional Information

Name: nach der Beziehung zu Arfvedsonit

References

Neues Jahrbuch für Mineralogie, Monatshefte (2004), 555

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

Refresh list

Actuality: 27. Mar 2024 - 12:43:21

Other languages

German

Kalium-Arfvedsonit

English

Potassic-arfvedsonite

Russian

Калийарфведсонит

Traditional Chinese

富鉀亞鐵鈉閃石

Simplified Chinese

富钾亚铁钠闪石

Japanese

カリアルペゾン閃石

Alternative Name

German

Kali-Arfvedsonit

Kalium-Arfvedsonit

German

Kaliumarfvedsonit

Potassicarfvedsonit

English

Potassicarfvedsonite

CNMNC (IMA)-Number

IMA 2003-043

CNMNC symbol

Symbol

Parf

Locations with GPS information

IDs

GUSID (Global unique identifier short form) pPTlBcrKSk-I0wSCYFaQew
GUID (Global unique identifier) 05E5F4A4-CACA-4F4A-88D3-04826056907B
Database ID 1855