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Montdorite

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Montdorit
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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

IDs

GUSID (Global unique identifier short form) FYGMgA_Zvk-JMiMtQAxRaA
GUID (Global unique identifier) 808C8115-D90F-4FBE-8932-232D400C5168
Database ID 2586