https://www.mineral-bosse.de
http://www.spessartit.de/walldorf.html
https://www.mineraliengrosshandel.com
https://www.mineralbox.biz
https://www.edelsteine-neuburg.de
'._('einklappen').'
 

Montdorite (Montdorit)

Pictures (1 Images total)

Montdorit
Views (File:
1586716715
): 259
Montdorit
schwarze Aggreagte von Montdorit in Matrix, Charlannes, La Bourboule, Puy-de-Dôme, Auvergne-Rhône-Alpes, Frankreich; BB ~ 4 mm
Copyright: Joy Desor; Contribution: openpit
Location: Frankreich/Auvergne-Rhône-Alpes, Region/Puy-de-Dôme, Département/Issoire, Arrondissement/La Bourboule/Charlannes
Mineral: Montdorite
Image: 1586716715
License: Usage for Mineralienatlas project only
Montdorit

schwarze Aggreagte von Montdorit in Matrix, Charlannes, La Bourboule, Puy-de-Dôme, Auvergne-Rhône-Alpes, Frankreich; BB 4 mm
Copyright: Joy Desor
Contribution: openpit 2020-04-12
Locality: Charlannes / La Bourboule / Issoire, Arrondissement / Puy-de-Dôme, Département / Auvergne-Rhône-Alpes, Region / Frankreich

Collectors Summary

Color grün, bräunlich grün
Crystal System monoklin, C2/m

Chemism

Chemical formula

KMn0.52+Fe1.52+Mg0.5[F2|Si4O10]

Chemical composition

Eisen, Magnesium, Mangan, Silicium, Fluor, Kalium, Sauerstoff

Unit weight: 472.82089145 u; Number of atoms in the formula: 19.5

Info

Empirical formula:

KMn0.5Fe1.5Mg0.5[F2Si4O10]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

33.84

10

51.28

15.9994300

159.9943000
Fluorine

F

8.04

2

10.26

18.9984033

37.9968065
Magnesium

Mg

2.57

0.5

2.56

24.3050600

12.1525300
Silicon

Si

23.76

4

20.51

28.0855300

112.3421200
Potassium

K

8.27

1

5.13

39.0983100

39.0983100
Manganese

Mn

5.81

0.5

2.56

54.9380499

27.4690250
Iron

Fe

17.72

1.5

7.69

55.8452000

83.7678000

Strunz 9th edition incl. updates

9.EC.15

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
C: Schichtsilikate (Phyllosilikate) mit Glimmer Tafeln, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
15:Muskovit-Gruppe

Lapis Classification

VIII/H.11-040

VIII: SILIKATE
H: Schichtsilikate
11: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Glimmer-Gruppe; Lithionit/Biotit-Reihe

Classification by Hölzel

9.ED.360

9: SILICATES
E: Phyllosilicates
D: Biotite-Group

IMA status

Neudefinition von der CNMNC anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Mica group  ⇒ True micas

Optical Properties

Color

grün, bräunlich grün

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.025
Birefringence chart\! Montdorite title=Birefringence chart Montdorite

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

1.580

RI value β

1.605

RI value γ / ε

1.605

Ri mean

1.597

2V angle

Biaxial (-) 0°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

5.310

Cell parameters b (Å)

9.20

Cell parameters c (Å)

10.175

Cell parameters a/b or c/a

0.577

Cell parameters c/b

1.106

Cell parameters α

90°

Cell parameters β

99.90

Cell parameters γ

90°

Z

2

Volumne (ų)

489.667

X-Ray Powder Diffraction

9.97(40),
3.41(30),
3.339(100),
3.142(30),
2.710(30),
2.519(40),
2.003(30),
1.669(30)
XRD chart Montdorite

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

Physical Properties

Density (g/cm³)

3.15 (gemessen)

3.207 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Frankreich/Auvergne-Rhône-Alpes, Region/Puy-de-Dôme, Département/Issoire, Arrondissement/La Bourboule/Charlannes

Preface

Author (Name, Year)

Robert & Maury, 1979

References

Canadian Mineralogist 36 (1998), 905

IMA group assignments

Other languages

German

Montdorit

Spanish

Montdorita

English

Montdorite

French

Montdorite

CNMNC symbol

Symbol

Mdr