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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

Volumne (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

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Actuality: 19. May 2022 - 11:14:43

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

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

German pages

DeWikiPedia - search for: Kalium-Arfvedsonit
Google-Bilder-Suche - search for: Kalium-Arfvedsonit
Mineralienatlas.de (Forum) - search for: Kalium-Arfvedsonit

English pages

Mindat - search for: Potassic-arfvedsonite
Webmineral - search for:Potassic-arfvedsonite
Handbook-of-Mineralogy - search for: Potassic-arfvedsonite
RRUFF - Raman, XRD and other mineral data - search for: Potassic-arfvedsonite
RRUFF - References and PDF downloads - search for: Potassic-arfvedsonite
American-Mineralogist-Crystal-Structure-Database - search for: Potassic-arfvedsonite
Strahlen.org - search for: Potassic-arfvedsonite

Russian pages

Webmineral.ru - search for: Калийарфведсонит

Mineral Dealer

German pages

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Crystal-Treasure.com - search for: Kalium-Arfvedsonit
Bosse - search for: Kalium-Arfvedsonit
Edelsteine Neuburg - Gundolf Fischer - search for: Kalium-Arfvedsonit

Locations with GPS information