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Eckermannite (Eckermannit)

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Eckermannit
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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

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 Fluor-Leakeit 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

Volumne (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 (2014)

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.

American Mineralogist 100 (2015), 909

IMA group assignments

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

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

German pages

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

English pages

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

Russian pages

Webmineral.ru - search for: Экерманнит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Eckermannit
Crystal-Treasure.com - search for: Eckermannit
Bosse - search for: Eckermannit
Edelsteine Neuburg - Gundolf Fischer - search for: Eckermannit
Geolitho marketplace, by and for collectors - search for: Eckermannit

Locations with GPS information