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Ferro-eckermannite

Collectors Summary

Color grün
Hardness (Mohs) 5 - 6
Cleavages gut
Crystal System monoklin, C2/m

Additional information / Summary

Natrium (Sodium) Amphibole
Natrium (Sodium) Amphibole

Chemism

Chem­ical formula

Na3(Fe2+,Mg)4AlSi8O22(OH)2

Chem­ical com­po­si­tion

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

Unit weight: 898.4779628 u; Number of atoms in the formula: 42

Info

Empirical formula:

Na3(Fe0.75Mg0.25)4AlSi8O22(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.22

2

4.76

1.0079470

2.0158940
Oxygen

O

42.74

24

57.14

15.9994300

383.9863200
Sodium

Na

7.68

3

7.14

22.9897702

68.9693106
Magnesium

Mg

2.71

1

2.38

24.3050600

24.3050600
Aluminium

Al

3.00

1

2.38

26.9815382

26.9815382
Silicon

Si

25.01

8

19.05

28.0855300

224.6842400
Iron

Fe

18.65

3

7.14

55.8452000

167.5356000

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.08-080

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

Clas­sifica­tion by Hölzel

9.DJ.320

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

Hey's Chem­ical Index of Min­er­als

16.20.05

16: Silicates Containing Aluminum and other Metals
20: Aluminosilicates of Fe, Mg and alkalis

Dana 8th edi­tion

66.01.03c.07

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 1997; Neudefinition vom Amphibol-Subkommittee (1997) als Eckermannit reich an Fe2+

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

 Amphibole supergroup  ⇒ (OH,F,Cl)-dominant amphiboles  ⇒ Sodium Amphiboles  ⇒ Eckermannite (Eck) amphiboles

Optical Properties

Color

grün

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 - 6

VHN (Hard­ness Vick­ers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Cleav­ages

gut

Preface

Author (Name, Year)

Phillips & Layton, 1964

References

Mineralogical Magazine 33 (1964), 1097.

American Mineralogist 63 (1978), 1023.

Rock-forming Minerals (Deer, Howie & Zussmann), 2B, 2nd ed. (1997), Table 31, anal. 6

Canadian Mineralogist 35 (1997), 219.

Mineralogical Record 29, 169-174.

Canadian Mineralogist 41 (2003), 1355.

Hawthorne, Frank C., and Roberta Oberti (2006), On the classification of amphiboles - Canadian Mineralogist 44(1), 1-21.

Frank C. Hawthorne, Roberta Oberti, George E. Harlow, Walter V. Maresch, Robert F. Martin, John C. Schumacer, Mark D. Welch (2012): Nomenclature of the amphibole supergroup, American Mineralogist, Volume 97, pages 2031–2048

IMA group assignments

Other languages

German

Ferro-Eckermannit

French

Ferro-Eckermannite

Spanish

Ferro-eckermannita

English

Ferro-eckermannite

Alternative Name

English

Ferroeckermannite

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

German pages

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English pages

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German pages

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Locations with GPS information