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Ferro-winchite

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Ferrowinchit
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Ferrowinchit

Schwarze plattige bis strahlig-stengelige Aggregate von Ferro-Winchit bis 2 cm Länge mit Pyrophyllit; Fundort: Bong Iron Mine, Bong Town, St. Paul's River, Kakata, Botota, Liberia
Copyright: McSchuerf
Contribution: Mineralienatlas 2005-01-16
Locality: Bong Mine / Bong Town / Bong Range / Bong, Region / Liberia

Collectors Summary

Color cobaltbalu bis violettblau
Streak color blass blaugrau
Lustre Glasglanz
Hardness (Mohs) 5.5
Crystal System monoklin, C2/m

Chemism

Chem­ical formula

NaCa(Fe2+,Mg)4AlSi8O22(OH)2

Chem­ical com­po­si­tion

Aluminium, Calcium, Eisen, Magnesium, Natrium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 892.5768224 u; Number of atoms in the formula: 41

Info

Empirical formula:

NaCa(Fe0.75Mg0.25)4AlSi8O22(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.23

2

4.88

1.0079470

2.0158940
Oxygen

O

43.02

24

58.54

15.9994300

383.9863200
Sodium

Na

2.58

1

2.44

22.9897702

22.9897702
Magnesium

Mg

2.72

1

2.44

24.3050600

24.3050600
Aluminium

Al

3.02

1

2.44

26.9815382

26.9815382
Silicon

Si

25.17

8

19.51

28.0855300

224.6842400
Calcium

Ca

4.49

1

2.44

40.0784000

40.0784000
Iron

Fe

18.77

3

7.32

55.8452000

167.5356000

Strunz 9th edi­tion incl. updates

9.DE.20

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
E: Ketten- und Bandsilikate mit 2-periodischen Doppelketten, Si4O11; Amphibol-Familie, Klinoamphibole
20:

Lapis Clas­sifica­tion

VIII/F.09-100

VIII: SILIKATE
F: Ketten- und Bandsilikate
9: Zweierbänder [Si4O11] 6-; Amphibol-Gruppe; Na-Ca-Amphibole

Clas­sifica­tion by Hölzel

9.DI.220

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
I: Amphiboles; Sodiccalcic Amphiboles
2: Winchite-Group

IMA sta­tus

anerkannt

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

 Amphibole supergroup  ⇒ (OH,F,Cl)-dominant amphiboles  ⇒ Sodium-calcium amphiboles  ⇒ Winchite (Win) amphiboles

Optical Properties

Color

cobaltbalu bis violettblau

Streak color

blass blaugrau

Lus­tre

Glasglanz

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell param­e­ters α

90°

Cell param­e­ters γ

90°

Physical Properties

Hard­ness (Mohs)

5.5

VHN (Hard­ness Vick­ers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

-

Preface

Author (Name, Year)

Leake, 1978

References

Mineralogical Record: 29: 169-174.

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

IMA group assignments

Other languages

German

Ferro-Winchit

Spanish

Ferro-winchita

English

Ferro-winchite

French

Ferro-winchite

Alternative Name

Italian

Ferrowinchita

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

German pages

 DeWikiPedia - search for: Ferro-Winchit
Google-Bilder-Suche - search for: Ferro-Winchit
Mineralienatlas.de (Forum) - search for: Ferro-Winchit

English pages

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

Mineral Dealer

German pages

 hausen - Mineralgroßhandel - search for: Ferro-Winchit
Crystal-Treasure.com - search for: Ferro-Winchit
Bosse - search for: Ferro-Winchit
Edelsteine Neuburg - Gundolf Fischer - search for: Ferro-Winchit

Locations with GPS information