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Grunerite (Grunerit)

Pictures (4 Images total)

Grünerit
Views (Image: 1204043502): 3248
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 (Image: 1284282936): 2678
Grunerit

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

Copyright: Dan Weinrich
Contribution: slugslayer 2010-09-12
Locality: Michigamme Mine (Mt Shasta Mine) / Michigamme / Marquette Iron Range / Marquette Co. / Michigan / USA
Grunerit (Amosit) - Fasern
Views (Image: 1591261616): 653
Grunerit (Amosit) - Fasern (SNr: J4D6)

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

Collection: prospector56
Copyright: prospector56
Contribution: prospector56 2020-06-04
Locality: Sekhukhuneland / Burgersfort / Bushveld Complex / Limpopo, Provinz / Südafrika
Grunerit
Views (Image: 1284282887): 2461
Grunerit

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

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

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

Volumne (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

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

German pages

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

English pages

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

Russian pages

Webmineral.ru - search for: Грюнерит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Grunerit
Crystal-Treasure.com - search for: Grunerit
Bosse - search for: Grunerit
Edelsteine Neuburg - Gundolf Fischer - search for: Grunerit

Locations with GPS information