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Eckermannite

Pictures (2 Images total)

Eckermannit
Views (File:
1217220593
): 3296
Eckermannit
Grüne Nadeln. Smaland / Jönköping / Gränna / Norra Kärr. 5x5cm.
Copyright: Doc Diether; Contribution: Doc Diether
Collection: Doc Diether
Location: Schweden/Jonköping, Provinz/Jönköping/Gränna/Norra Kärr
Mineral: Eckermannite
Image: 1217220593
License: Usage for Mineralienatlas project only
Eckermannit

Grüne Nadeln. Smaland / Jönköping / Gränna / Norra Kärr. 5x5cm.
Collection: Doc Diether
Copyright: Doc Diether
Contribution: Doc Diether 2008-07-28
Locality: Norra Kärr / Gränna / Jönköping / Jonköping, Provinz / Schweden
Eckermannit xx BB 10 mm
Views (File:
1721225179
): 149
Eckermannit xx BB 10 mm
Eckernannit xx ´´
Copyright: Berthold Kunz; Contribution: Mikromounter
Location: Schweden/Skåne, Provinz/Helsingborg/Fjärestad/Norra Vallåkra Gruva
Mineral: Eckermannite
Image: 1721225179
License: Usage for Mineralienatlas project only
Eckermannit xx BB 10 mm

Eckernannit xx ´´
Copyright: Berthold Kunz
Contribution: Mikromounter 2024-07-17
Locality: Norra Vallåkra Gruva / Fjärestad / Helsingborg / Skåne, Provinz / Schweden

Collectors Summary

Color blau grün
Streak color grünlichweiß
Hardness (Mohs) 5.5
Solubility - Säuren
Crystal System monoklin, C2/m

Additional information / Summary

Das Originalmaterial von Eckermannit aus dem Naturhistorischen Museum in London (BM 1949.151) und das Originalmaterial analysiert von Törnebohm (1906) wurden beide als Fluoroleakeit identifiziert.

Eine Studie der Literatur zeigt, dass die einzige Analyse, die wirklich Eckermannit zeigt, die Probe AMNH 108401 aus dem Hpakant-Tawmaw Jade-Gangzug in Myanmar ist.

Chemism

Chemical formula

NaNa2(Mg4Al)Si8O22(OH)2

Empirical formula (analysis)

(Na0.87K0.06)Σ0.93(Na1.89Ca0.11)Σ2.00(Mg3.87Fe2+0.09Mn0.01Fe3+0.38Al0.62)Σ4.97Si8.00O22(F0.03OH1.97)Σ2

Chemical composition

Aluminium, Magnesium, Natrium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 803.0187864225 u; Number of atoms in the formula: 40.9

Info

Empirical formula:

(Na0.87K0.06)(Na1.89Ca0.11)(Mg3.87Fe0.09Mn0.01Fe0.38Al0.62)Si8.00O22(F0.03OH1.97)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.25

1.97

4.82

1.0079470

1.9856556
Oxygen

O

45.83

23

56.23

15.9994300

367.9868900
Fluorine

F

0.07

0.03

0.07

18.9984033

0.5699521
Sodium

Na

7.90

2.76

6.75

22.9897702

63.4517658
Magnesium

Mg

11.71

3.87

9.46

24.3050600

94.0605822
Aluminium

Al

2.08

0.62

1.52

26.9815382

16.7285537
Silicon

Si

27.98

8

19.56

28.0855300

224.6842400
Potassium

K

0.29

0.06

0.15

39.0983100

2.3458986
Calcium

Ca

0.55

0.11

0.27

40.0784000

4.4086240
Manganese

Mn

0.07

0.01

0.02

54.9380499

0.5493805
Iron

Fe

3.27

0.47

1.15

55.8452000

26.2472440

Analysis wt%

SiO2 : 56.48, Al2O3 : 1.22, Fe2O3 : 8.38, FeO : 2.67, MgO : 17.40, CaO : 2.70, Na2O : 8.09, K2O : 1.82, H2O : 0.87 (Ref: Econ.Geol. 40)

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.08-070

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

Classification by Hölzel

9.DJ.300

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

Dana 8th edition

66.01.03c.06

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 von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

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

Optical Properties

Color

blau grün

Streak color

grünlichweiß

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.017
Birefringence chart\! Eckermannite title=Birefringence chart Eckermannite

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

1.625

RI value β

1.639

RI value γ / ε

1.642

Ri mean

1.635

2V angle

Biaxial (-) 60°!!

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

9.8087(7)

Cell parameters b (Å)

17.8448(13)

Cell parameters c (Å)

5.2905(4)

Cell parameters a/b or c/a

0.55

Cell parameters c/b

0.296

Cell parameters α

90°

Cell parameters β

103.660(1)º

Cell parameters γ

90°

Z

2

Volume (ų)

899.826

X-Ray Powder Diffraction

8.407(42), 3.395(59), 3.257(34), 3.128(56), 2.966(33), 2.702(100), 2.574(36), 2.525(56)
XRD chart Eckermannite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.5

VHN (Hardness Vickers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3 - 3.17 / Durchschnittlich = 3.08

2.964 ( ρ calc. Mineralienatlas )

Instability

- Säuren

(Co-)Type locality

(Co-)Type locality

Myanmar (Burma)/Kachin-Staat/Mohnyin, Distrikt/Hpakant Township/Hpakant-Tawmaw Jade-Gangzug

Type material

Department of Earth and Planetary Sciences, American Museum of Natural History, New York, NY, USA

Collection number of type material

AMNH H108401

Preface

Author (Name, Year)

Roberta Oberti, Massimo Boiocchi, Frank C. Hawthorne, Neil A. Ball and George E. Harlow (2015)

References

Canadian Mineralogist 41 (2003), 1355

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

Oberti, R., Boiocchi, M., Hawthorne, F.C., Ball, N.A. and Harlow, G.E. (2014) Eckermannite, IMA 2013-136. CNMNC Newsletter No. 20, June 2014, page 553; Mineralogical Magazine, 78, 549-558.

Roberta Oberti, Massimo Boiocchi, Frank C. Hawthorne, Neil A. Ball, George E. Harlow: Eckermannite revised: The new holotype from the Jade Mine Tract, Myanmar—crystal structure, mineral data, and hints on the reasons for the rarity of eckermannite. American Mineralogist Vol. 100, Nr. 4 (2015) S. 909-914. doi:10.2138/am-2015-5132

IMA group assignments

 
Amphibole supergroup
 
 
 

 
 
(OH,F,Cl)-dominant amphiboles
 
 
 

 
 
 
Sodium Amphiboles
 
 
 

 
 
 
 
Eckermannite (Eck) amphiboles
 
 
 

 
 
 
 
 
Eckermannite
NaNa2(Mg4Al)Si8O22(OH)2
monoklin
C2/m

 
 
 
 
 
Ferro-eckermannite
Na3(Fe2+,Mg)4AlSi8O22(OH)2
monoklin
C2/m

 
 
 
 
 
Mangani-eckermannite
NaNa2(Mg4Mn3+)Si8O22(OH)2
monoklin
C2/m

 
 
 
 
 
Mangano-ferri-eckermannite
Na3Mn2+4(Fe3+,Al)Si8O22(OH,F)2
monoklin
C2/m

 
 
 
 
 
Scandio-fluoro-eckermannite
NaNa2(Mg4Sc)(Si8O22)F2
monoklin
C2/m

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Actuality: 05. Dec 2024 - 07:05:59

Other languages

German

Eckermannit

Spanish

Eckermannita

French

Eckermannite

English

Eckermannite

Russian

Экерманит

Russian

Экерманнит

Japanese

ｴｶｰﾏﾝ閃石

Alternative Name

Traditional Chinese

氟鎂鈉閃石

Simplified Chinese

氟镁钠闪石

Traditional Chinese

鎂鋁鈉閃石

Simplified Chinese

镁铝钠闪石

CNMNC (IMA)-Number

IMA 2013-136

CNMNC symbol

Symbol

Eck

Locations with GPS information

IDs

GUSID (Global unique identifier short form) ymk0o_DXaku2lAc-6U9N1w
GUID (Global unique identifier) A33469CA-D7F0-4B6A-B694-073EE94F4DD7
Database ID 995