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Grunerite

Pictures (4 Images total)

Grünerit
Views (File:
1204043502
): 3417
Grünerit
strahliger Grünerit; FO: Stollberg, Schweden; Bildausschnitt etwa 3 mm
Copyright: rtbstone; Contribution: rtbstone
Collection: rtbstone
Location: Schweden/Dalarna, Provinz/Ludvika/Västra Silvberg/Stollberg-Feld
Mineral: Grunerite
Image: 1204043502
License: Usage for Mineralienatlas project only
Grünerit

strahliger Grünerit; FO: Stollberg, Schweden; Bildausschnitt etwa 3 mm

Collection: rtbstone
Copyright: rtbstone
Contribution: rtbstone 2008-02-26
Locality: Stollberg-Feld / Västra Silvberg / Ludvika / Dalarna, Provinz / Schweden
Grunerit
Views (File:
1284282936
): 2975
Grunerit
Größe: 34x20x18 mm; Fundort: Michigamme Mine (Mt Shasta Mine), Michigamme, Marquette Iron Range, Marquette Co., Michigan, USA
Copyright: Dan Weinrich; Contribution: Philip Blümner
Location: USA/Michigan/Marquette Co./Marquette Iron Range/Michigamme/Michigamme Mine (Mt Shasta Mine)
Mineral: Grunerite
Image: 1284282936
License: Usage for Mineralienatlas project only
Grunerit

Größe: 34x20x18 mm; Fundort: Michigamme Mine (Mt Shasta Mine), Michigamme, Marquette Iron Range, Marquette Co., Michigan, USA

Copyright: Dan Weinrich
Contribution: Philip Blümner 2010-09-12
Locality: Michigamme Mine (Mt Shasta Mine) / Michigamme / Marquette Iron Range / Marquette Co. / Michigan / USA
Grunerit (Amosit) - Fasern
Views (File:
1591261616
): 895
Grunerit (Amosit) - Fasern
Fundort: Penge Mine, Sekhukhune District, Limpopo, Südafrika, Bildbreite 6 mm
Copyright: prospector56; Contribution: prospector56
Collection: Lithothek der Münchener Micromounter, Collection number: A046701, Donator: prospector56
Location: Südafrika/Limpopo, Provinz/Bushveld Complex/Burgersfort/Sekhukhuneland
Mineral: Grunerite
Image: 1591261616
License: Usage for Mineralienatlas project only
Grunerit (Amosit) - Fasern (SNr: A046701)

Fundort: Penge Mine, Sekhukhune District, Limpopo, Südafrika, Bildbreite 6 mm

Collection: Lithothek der Münchener Micromounter
Copyright: prospector56
Contribution: prospector56 2020-06-04
Locality: Sekhukhuneland / Burgersfort / Bushveld Complex / Limpopo, Provinz / Südafrika
Grunerit
Views (File:
1284282887
): 2619
Grunerit
Bildbreite: 5 mm; Fundort: Michigamme Mine (Mt Shasta Mine), Michigamme, Marquette Iron Range, Marquette Co., Michigan, USA
Copyright: Leonardus; Contribution: Philip Blümner
Location: USA/Michigan/Marquette Co./Marquette Iron Range/Michigamme/Michigamme Mine (Mt Shasta Mine)
Mineral: Grunerite
Image: 1284282887
Rating: 3 (votes: 1)
License: Usage for Mineralienatlas project only
Grunerit

Bildbreite: 5 mm; Fundort: Michigamme Mine (Mt Shasta Mine), Michigamme, Marquette Iron Range, Marquette Co., Michigan, USA

Copyright: Leonardus
Contribution: Philip Blümner 2010-09-12
Locality: Michigamme Mine (Mt Shasta Mine) / Michigamme / Marquette Iron Range / Marquette Co. / Michigan / USA

You find additional specimen at the Geolitho Museum

Collectors Summary

Color aschgrau, bräunlichgrün
Streak color weiß
Hardness (Mohs) 5 - 6
Solubility +++ HF, - Säuren
Crystal System monoklin, C2/m

Chemism

Chemical formula

☐(Fe2+,Mg)7Si8O22(OH)2

Chemical composition

Eisen, Magnesium, Silicium, Sauerstoff, Wasserstoff, Vakanz

Unit weight: 946.40760901 u; Number of atoms in the formula: 42

Info

Empirical formula:

Vc(Fe0.75Mg0.25)7Si8O22(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Vacancy

Vc

0.00

1

2.38

0.0000000

0.0000000

Hydrogen

H

0.21

2

4.76

1.0079470

2.0158940

Oxygen

O

40.57

24

57.14

15.9994300

383.9863200

Magnesium

Mg

4.49

1.75

4.17

24.3050600

42.5338550

Silicon

Si

23.74

8

19.05

28.0855300

224.6842400

Iron

Fe

30.98

5.25

12.50

55.8452000

293.1873000

Analysis wt%

SiO2 : 49.01, FeO : 44.99, MgO : 3.17, H2O : 1.59, F : 1.00 (Ref: American Mineralogist 64)

Strunz 9th edition incl. updates

9.DE.05

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

Lapis Classification

VIII/F.07-030

VIII: SILIKATE
F: Ketten- und Bandsilikate
7: Zweierbänder [Si4O11] 6-; Amphibol-Gruppe; Mg-Fe-Mn-Amphibole

Classification by Hölzel

9.DG.120

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
G: Amphiboles; Monoclinic Amphiboles
1: Cummingtonite-Grünerite-Group

Dana 8th edition

66.01.01.03

66: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2
01: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2 with P=2 amphibole configuration
01: Group 1, the Mg-Fe-Mn-Li amphiboles (Monoclinic)

IMA status

Neudefinition von der CNMNC anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Amphibole supergroup  ⇒ (OH,F,Cl)-dominant amphiboles  ⇒ Magnesium-iron-manganese amphiboles  ⇒ Grunerite (Gru) amphiboles

Optical Properties

Color

aschgrau, bräunlichgrün

Streak color

weiß

max. Birefringence

0.03~

Birefringence chart\! Grunerite title=Birefringence chart Grunerite

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

1.68

RI value β

1.69

RI value γ / ε

1.71

Ri mean

1.693

2V angle

Biaxial (-) 93°~

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

9.562

Cell parameters b (Å)

18.380

Cell parameters c (Å)

5.338

Cell parameters a/b or c/a

0.520

Cell parameters c/b

0.290

Cell parameters α

90°

Cell parameters β

101.87

Cell parameters γ

90°

Z

2

Volume (ų)

918.09

X-Ray Powder Diffraction

9.208(50),
8.330(100),
3.880(50),
3.466(50),
3.071(80),
2.765(90),
2.639(70),
2.507(60)

XRD chart Grunerite

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 - 6

VHN (Hardness Vickers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.54 (gemessen)

3.423 ( ρ calc. Mineralienatlas )

Instability

+++ HF, - Säuren

Preface

Author (Name, Year)

Kenngott, 1853

Additional Information

Benannt nach dem Erstanalysist `Louis Emmanuel Gruner` (1809-1883), schweizerisch-französischer Chemiker

Safety Instructions

Industrial chemicals are often present in powder form and therefore often contain much higher dangers than natural, crystalline substances. These hazard statements refer to the classification of industrially used chemical compounds that may also occur in this natural mineral. The hazard classification makes no claim to completeness.




Safety classes: H350: Kann Krebs erzeugen., H372: Schädigt die Organe bei längerer oder wiederholter Exposition.

References

Canadian Mineralogist 35 (1997), 219

IMA group assignments

Other languages

Dutch

Amosiet

Spanish

Amosita

German

Grunerit

French

Grunerite

English

Grunerite

Spanish

Grünerita

Russian

Грюнерит

Simplified Chinese

铁闪石

Alternative Name

German

Amosit

English

Amosite

Brown Asbestos

English

Galizinite

English

Gallicinite

English

Montasite

CNMNC symbol

Symbol

Gru

Locations with GPS information

IDs

GUSID (Global unique identifier short form) npTd_-QkiUm2Dmy3hXtz-Q
GUID (Global unique identifier) FFDD949E-24E4-4989-B60E-6CB7857B73F9
Database ID 1465