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Magnesio-fluoro-arfvedsonite

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Fluoro-Magnesio-Arfvedsonit
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Fluoro-Magnesio-Arfvedsonit
Dunkelgrün in Alkali-Trachyt. Berkum, Meckenheim Siebengebirge, Nordrhein-Westfalen; B:7x4cm.
Copyright: Doc Diether; Contribution: Doc Diether
Collection: Doc Diether
Location: Deutschland/Nordrhein-Westfalen/Köln, Bezirk/Rhein-Sieg-Kreis/Wachtberg/Berkum/Hohenburg (Hohenberg)
Mineral: Magnesio-fluoro-arfvedsonite
Image: 1264268880
License: Usage for Mineralienatlas project only
Fluoro-Magnesio-Arfvedsonit

Dunkelgrün in Alkali-Trachyt. Berkum, Meckenheim Siebengebirge, Nordrhein-Westfalen; B:7x4cm.

Collection: Doc Diether
Copyright: Doc Diether
Contribution: Doc Diether 2010-01-23
Locality: Hohenburg (Hohenberg) / Berkum / Wachtberg / Rhein-Sieg-Kreis / Köln, Bezirk / Nordrhein-Westfalen / Deutschland

Collectors Summary

Color grün
Streak color weiß
Hardness (Mohs) 5
Cleavages gut (110)
Fracture uneben
Crystal System monoklin, C2/m

Chemism

Chem­ical formula

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

Chem­ical com­po­si­tion

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

Unit weight: 871.275018925 u; Number of atoms in the formula: 40.5

Info

Empirical formula:

(Na0.75K0.25)Na2(Mg0.75Fe0.25)4Fe[(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

41.32

22.5

55.56

15.9994300

359.9871750

Fluorine

F

3.27

1.5

3.70

18.9984033

28.4976049

Sodium

Na

7.26

2.75

6.79

22.9897702

63.2218681

Magnesium

Mg

8.37

3

7.41

24.3050600

72.9151800

Silicon

Si

25.79

8

19.75

28.0855300

224.6842400

Potassium

K

1.12

0.25

0.62

39.0983100

9.7745775

Iron

Fe

12.82

2

4.94

55.8452000

111.6904000

Anal­y­sis wt%

SiO2 : 56.76, TiO2 : 0.51, Al2O3 : 1.47, Fe2O3 : 5.76, MgO : 20.10, FeO : 0.79, CaO : 2.86, Na2O : 7.50, K2O : 1.62, F : 2.80, H2O : 0.84 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 2000)

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.08-152

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

Clas­sifica­tion by Hölzel

9.DJ.410

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

IMA sta­tus

anerkannt

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Classification

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

Optical Properties

Color

grün

Streak color

weiß

max. Birefrin­gence

0.014

Birefringence chart\! Magnesio-fluoro-arfvedsonite title=Birefringence chart 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

1.618

RI value β

1.629

RI value γ / ε

1.632

Ri mean

1.626

2V angle

Biaxial (-) 54°

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell param­e­ters a (Å)

9.81

Cell param­e­ters b (Å)

18.05

Cell param­e­ters c (Å)

5.29

Cell param­e­ters a/b or c/a

0.543

Cell param­e­ters c/b

0.293

Cell param­e­ters α

90°

Cell param­e­ters β

103.90

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

909.273

X-Ray Pow­der Diffrac­tion

8.42(30),
3.392(10),
3.264(20),
3.129(100),
2.804(30),
2.716(10),
2.708(20),
1.895(10)

XRD chart Magnesio-fluoro-arfvedsonite

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

Crystals 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

5

VHN (Hard­ness Vick­ers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.09 (gemessen)

3.182 ( ρ calc. Mineralienatlas )

Cleav­ages

gut (110)

Frac­ture

uneben

Tenac­ity

spröde

Preface

Author (Name, Year)

Bazhenov & Nedosekova & Krinova & Mironov & Khvorov, 2000

References

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

IMA group assignments

Other languages

Spanish

Fluoromagnesioarfvedsonita

French

Fluoromagnesioarfvedsonite

German

Magnesio-Fluoro-Arfvedsonit

English

Magnesio-fluoro-arfvedsonite

CNMNC (IMA)-Number

IMA 1998-056

CNMNC symbol

Symbol

Mfarf

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

German pages

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

English pages

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

Mineral Dealer

German pages

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Crystal-Treasure.com - search for: Magnesio-Fluoro-Arfvedsonit
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Locations with GPS information