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Ekmanite (Ekmanit)

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Ekmanit
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Ekmanit
Schwarz-braun. Brunnsjö Gruvan, Hällefors, Västmanland, Schweden. 6x7 cm.
Copyright: Doc Diether; Contribution: Doc Diether
Collection: Doc Diether
Location: Schweden/Örebro, Provinz/Hällefors/Grythyttan/Brunnsjö Mine
Mineral: Ekmanite
Image: 1216632731
Rating: 5.33 (votes: 3)
License: Usage for Mineralienatlas project only
Ekmanit

Schwarz-braun. Brunnsjö Gruvan, Hällefors, Västmanland, Schweden. 6x7 cm.
Collection: Doc Diether
Copyright: Doc Diether
Contribution: Doc Diether 2008-07-21
Locality: Brunnsjö Mine / Grythyttan / Hällefors / Örebro, Provinz / Schweden

You find additional Ekmanit specimen at the Geolitho Museum

Collectors Summary

Color grün, grauweiß, schwarz
Cleavages {???} gut
Solubility tendiert zum Dunkeln and der Luft
Crystal System hexagonal,

Chemism

Chemical formula

(Fe2+,Mg,Mn,Fe3+)3(Si,Al)4O10(OH)2·2H2O

Chemical composition

Aluminium, Eisen, Magnesium, Mangan, Silicium, Sauerstoff, Wasserstoff

Unit weight: 480.15515917 u; Number of atoms in the formula: 27

Info

Empirical formula:

(Fe0.55Mg0.3Mn0.1Fe0.05)3(Si0.75Al0.25)4O10(OH)2·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.26

6

22.22

1.0079470

6.0476820
Oxygen

O

46.65

14

51.85

15.9994300

223.9920200
Magnesium

Mg

4.56

0.9

3.33

24.3050600

21.8745540
Aluminium

Al

5.62

1

3.70

26.9815382

26.9815382
Silicon

Si

17.55

3

11.11

28.0855300

84.2565900
Manganese

Mn

3.43

0.3

1.11

54.9380499

16.4814150
Iron

Fe

20.94

1.8

6.67

55.8452000

100.5213600

Strunz 9th edition incl. updates

9.EG.40

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
G: Doppelnetze mit sechsfach-Ringen
40:Stilpnomelan-Gruppe

Classification by Hölzel

9.EG.265

9: SILICATES
E: Phyllosilicates
G: Hydrated Micas
2: With Mn

Optical Properties

Color

grün, grauweiß, schwarz

Diaphaneity (Transparency)

durchscheinend bis teilweise opak

max. Birefringence

u nicht bestimmt

Crystallography

Crystal System

hexagonal

Cell parameters a (Å)

22.038

Cell parameters b (Å)

-

Cell parameters c (Å)

24.199

Cell parameters a/b or c/a

1.098

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

94.3

Cell parameters γ

90°

Z

12

Volumne (ų)

10178.233

Physical Properties

Density (g/cm³)

0.94 ( ρ calc. Mineralienatlas )

Cleavages

{???} gut

Instability

tendiert zum Dunkeln and der Luft

(Co-)Type locality

(Co-)Type locality

Schweden/Örebro, Provinz/Hällefors/Grythyttan/Brunnsjö Mine

Preface

Author (Name, Year)

Igelström, 1865

References

American Mineralogist 39 (1954), 946.

Canadian Mineralogist 36 (1998), 905.

European Journal of Mineralogy 11 (1999), 299.

Other languages

German

Ekmanit

Spanish

Ekmanita

English

Ekmanite

Japanese

ｴｸﾏﾝ石

Alternative Name

Ekmannite