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Cummingtonite

Pictures (3 Images total)

Cummingtonit
Views (File:
1216633219
): 4902
Cummingtonit
FO: Gefunden in der Dannemora Mine, Uppsala Län, Uppland, Schweden, faserige, bräunliche Kristalle, Bildbreite 2,2 mm.
Copyright: Hannes Osterhammer; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: B000905, Donator: Manfred Seitz
Location: Schweden/Uppsala, Provinz/Östhammar/Dannemora/Dannemora Mine
Mineral: Cummingtonite
Image: 1216633219
Rating: 8.5 (votes: 2)
License: Usage for Mineralienatlas project only
Cummingtonit (SNr: B000905)

FO: Gefunden in der Dannemora Mine, Uppsala Län, Uppland, Schweden, faserige, bräunliche Kristalle, Bildbreite 2,2 mm.

Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: Münchener Micromounter 2008-07-21
Locality: Dannemora Mine / Dannemora / Östhammar / Uppsala, Provinz / Schweden
Cummingtonit
Views (File:
1292446001
): 3989
Cummingtonit
Bräunliche strahlige Kristallaggregate; BB = 9,2 mm. Fundort: Te Aroha Station, Hokitika, West Coast Region, South Island, Neuseeland.
Copyright: Hannes Osterhammer; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A009216, Donator: Ron Keene
Location: Neuseeland/South Island/West Coast, Region/Hokitika/Te Aroha Station
Mineral: Cummingtonite
Image: 1292446001
License: Usage for Mineralienatlas project only
Cummingtonit (SNr: A009216)

Bräunliche strahlige Kristallaggregate; BB = 9,2 mm. Fundort: Te Aroha Station, Hokitika, West Coast Region, South Island, Neuseeland.

Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: Münchener Micromounter 2010-12-15
Locality: Te Aroha Station / Hokitika / West Coast, Region / South Island / Neuseeland
Cummingtonit
Views (File:
1613639864
): 747
Cummingtonit
Södra, Garpenberg, Hedemora, Dalarna, SE. BB: 5cm.
Copyright: Doc Diether; Contribution: Doc Diether
Collection: Doc Diether
Location: Schweden/Dalarna, Provinz/Hedemora/Garpenberg/Södra
Mineral: Cummingtonite
Image: 1613639864
License: Usage for Mineralienatlas project only
Cummingtonit

Södra, Garpenberg, Hedemora, Dalarna, SE. BB: 5cm.

Collection: Doc Diether
Copyright: Doc Diether
Contribution: Doc Diether 2021-02-18
Locality: Södra / Garpenberg / Hedemora / Dalarna, Provinz / Schweden

You find additional specimen at the Geolitho Museum

Collectors Summary

Color dunkelgrün
Streak color weiß
Hardness (Mohs) 5.00 - 6.00
Solubility +++ HF, - HCl
Crystal System monoklin, C2/m

Chemism

Chemical formula

☐(Mg,Fe2+,Mn2+)7Si8O22(OH)2

Chemical composition

Eisen, Magnesium, Mangan, Silicium, Sauerstoff, Wasserstoff, Vakanz

Unit weight: 868.49926094 u; Number of atoms in the formula: 42

Info

Empirical formula:

Vc(Mg0.6Fe0.3Mn0.1)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

0.23

2

4.76

1.0079470

2.0158940

Oxygen

O

44.21

24

57.14

15.9994300

383.9863200

Magnesium

Mg

11.75

4.2

10.00

24.3050600

102.0812520

Silicon

Si

25.87

8

19.05

28.0855300

224.6842400

Manganese

Mn

4.43

0.7

1.67

54.9380499

38.4566349

Iron

Fe

13.50

2.1

5.00

55.8452000

117.2749200

Analysis wt%

SiO2 : 52.28, FeO : 31.90, MnO : 0.57, MgO : 12.35, CaO : 0.79, H2O : 1.62 (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.07-020

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

Classification by Hölzel

9.DG.100

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

Dana 8th edition

66.01.01.02

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  ⇒ Cummingtonite (Cum) amphiboles

Optical Properties

Color

dunkelgrün

Streak color

weiß

max. Birefringence

0.032

Birefringence chart\! Cummingtonite title=Birefringence chart Cummingtonite

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

1.656

RI value β

1.671

RI value γ / ε

1.688

Ri mean

1.672

2V angle

Biaxial (+) 87°!

Optical Data Luminescence

Color LW-UV (365nm)

 

gelblich weiß

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

9.534

Cell parameters b (Å)

18.321

Cell parameters c (Å)

5.324

Cell parameters a/b or c/a

0.520

Cell parameters c/b

0.291

Cell parameters α

90°

Cell parameters β

101.97

Cell parameters γ

90°

Z

2

Volume (ų)

909.735

X-Ray Powder Diffraction

9.16(40),
8.32(100),
4.58(10),
3.270(20),
3.072(20),
2.763(20),
2.635(30),
1.599(10)

XRD chart Cummingtonite

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)

5.00 - 6.00

VHN (Hardness Vickers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.37 (gemessen)

3.17 ( ρ calc. Mineralienatlas )

Instability

+++ HF, - HCl

(Co-)Type locality

(Co-)Type locality

USA/Massachusetts/Hampshire Co./Cummington

Preface

Author (Name, Year)

Dewey, 1824

References

Canadian Mineralogist 35 (1997), 219

IMA group assignments





 
 
 
 
 
☐(Mg,Fe2+,Mn2+)7Si8O22(OH)2
monoklin
C2/m

 
 
 
 
 
☐Mn2(Mg,Fe)5Si8O22(OH)2
monoklin
C2/m

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Actuality: 25. Mar 2024 - 00:23:18

Other languages

Dutch

Cummingtoniet

German

Cummingtonit

Spanish

Cummingtonita

English

Cummingtonite

French

Cummingtonite

Russian

Куммингтонит

Ukrainian

Кумінгтоніт

Japanese

カミントン閃石

Alternative Name

Amphibole-anthophyllite

German

Antholit

Spanish

Antholita

English

Clino-anthophyllite

German

Kievit

Spanish

Kievita

English

Kievite

Magnesiocummingtonit

Spanish

Magnesiocummingtonita

Magnesiocummingtonite

Simplified Chinese

铁镁闪石

Simplified Chinese

镁铁闪石

CNMNC symbol

Symbol

Cum

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Xpw5buU6U0KcSLogdytCOQ
GUID (Global unique identifier) 6E399C5E-3AE5-4253-9C48-BA20772B4239
Database ID 849