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Middendorfite (Middendorfit)

Pictures (1 Images total)

Middendorfit
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1581179055
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Middendorfit
oranger Kristall von Middendorfit, Kirovsky Mine, Kukisvumchorr, Chibiny, Kola, Russland; BB < 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Chibiny (Khibiny)/Kukisvumchorr/Kirovsky Mine (Kirovskii Apatit Mine, Kirov)
Mineral: Middendorfite
Image: 1581179055
License: Usage for Mineralienatlas project only
Middendorfit

oranger Kristall von Middendorfit, Kirovsky Mine, Kukisvumchorr, Chibiny, Kola, Russland; BB < 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-02-08
Locality: Kirovsky Mine (Kirovskii Apatit Mine, Kirov) / Kukisvumchorr / Chibiny (Khibiny) / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color dunkel- bis hellorange
Lustre Glasglanz
Hardness (Mohs) 3 - 3.5
Cleavages vollkommen (001)
Fracture lamellar
Crystal System monoklin, P21/m, P21

Chemism

Chemical formula

K3Na2Mn5Si12(O,OH)36·2H2O

Additional chem. information

gehört zur Gruppe der Ganophyllit- und Stilpnomelan Mineralien

Chemical composition

Mangan, Natrium, Silicium, Kalium, Sauerstoff, Wasserstoff

Unit weight: 1396.0727309 u; Number of atoms in the formula: 73

Info

Empirical formula:

K3Na2Mn5Si12(O0.75(OH)0.25)36·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.94

13

17.81

1.0079470

13.1033110
Oxygen

O

43.55

38

52.05

15.9994300

607.9783400
Sodium

Na

3.29

2

2.74

22.9897702

45.9795404
Silicon

Si

24.14

12

16.44

28.0855300

337.0263600
Potassium

K

8.40

3

4.11

39.0983100

117.2949300
Manganese

Mn

19.68

5

6.85

54.9380499

274.6902495

Analysis wt%

SiO2 : 50.87, FeO : 0.68, MnO : 24.88, Na2O : 4.55, K2O : 10.16, H2O : 7.73 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 2006)

Strunz 9th edition incl. updates

9.EJ.10

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
J:
10:Middendorfit-Gruppe

Lapis Classification

VIII/H.17-042

VIII: SILIKATE
H: Schichtsilikate
17: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen;

Classification by Hölzel

9.EG.235

9: SILICATES
E: Phyllosilicates
G: Hydrated Micas
2: With Mn

IMA status

anerkannt 2005

Mineral status

anerkanntes Mineral

Optical Properties

Color

dunkel- bis hellorange

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.029
Birefringence chart\! Middendorfite title=Birefringence chart Middendorfite

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

1.534

RI value β

1.562

RI value γ / ε

1.563

Ri mean

1.553

2V angle

Biaxial (-) 90°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m, 2

Space Group number

11, 4

Space Group

P21/m, P21

Cell parameters a (Å)

12.55

Cell parameters b (Å)

5.721

Cell parameters c (Å)

26.86

Cell parameters a/b or c/a

2.194

Cell parameters c/b

4.695

Cell parameters α

90°

Cell parameters β

114.3

Cell parameters γ

90°

Z

2

Volume (ų)

1757.649

X-Ray Powder Diffraction

12.28 (100), 4.31(81), 3.555(62), 2.840(90), 2.634(88), 2.366(76), 1.669(64), 1.614(56)

Physical Properties

Hardness (Mohs)

3 - 3.5

VHN (Hardness Vickers)

108 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.6

2.638 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen (001)

Fracture

lamellar

Tenacity

flexibel aber unelastisch

(Co-)Type locality

(Co-)Type locality

Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Chibiny (Khibiny)/Kukisvumchorr/Kirovsky Mine (Kirovskii Apatit Mine, Kirov)/Hilairitovoye-Pegmatit

Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Chibiny (Khibiny)/Kukisvumchorr

Preface

Author (Name, Year)

Pekov & Chukanov & Dubinchuk & Zadov, 2006

References

I. V. Pekov, N. V. Chukanov, V. T. Dubinchuk & A. E. Zadov (2006): Middendorfite, K3Na2Mn5Si12(O,OH)36·2H2O, a new mineral from Khibiny Massif, Kola Peninsula. Proceedings of the Russian Mineralogical Society, 135(3), 42–52.

Other languages

German

Middendorfit

English

Middendorfite

Russian

Миддендорфит

CNMNC (IMA)-Number

IMA 2005-028

CNMNC symbol

Symbol

Mdd

Locations with GPS information

IDs

GUSID (Global unique identifier short form) uxxxCKHDtkSoMMhJYcWFuQ
GUID (Global unique identifier) 08711CBB-C3A1-44B6-A830-C84961C585B9
Database ID 4424