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Potassic-mangani-leakeite (Kornit)

Pictures (1 Images total)

Kalium-Mangani-Leakeit
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Kalium-Mangani-Leakeit
rotbraune, faserige Aggregate von Kalium-Mangani-Leakeit, Wessels Mine, Hotazel, Kalahari-Manganfelder, Republik Südafrika; BB < 5 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Hotazel/Wessel's Mine (Wessels Mine)
Mineral: Potassic-mangani-leakeite
Image: 1607510238
License: Usage for Mineralienatlas project only
Kalium-Mangani-Leakeit

rotbraune, faserige Aggregate von Kalium-Mangani-Leakeit, Wessels Mine, Hotazel, Kalahari-Manganfelder, Republik Südafrika; BB < 5 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-12-09
Locality: Wessel's Mine (Wessels Mine) / Hotazel / Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika

Collectors Summary

Color bräunlich lila, dunkelrot
Streak color nd
Cleavages parallel zu [001]
Crystal System monoklin, C2/m

Chemism

Chemical formula

KNa2(Mg2Mn3+2Li)[Si8O22](OH)2

Empirical formula (analysis)

(K0.62Na0.38)Na2(Mg1.94(Mn,Fe)2+0.36(Mn,Fe)3+1.85Li0.85)[Si8O22](OH)2

Chemical composition

Lithium, Magnesium, Mangan, Natrium, Silicium, Kalium, Sauerstoff, Wasserstoff

Unit weight: 864.60918638525 u; Number of atoms in the formula: 42

Info

Empirical formula:

(K0.62Na0.38)Na2(Mg1.94(Mn0.75Fe0.25)0.36(Mn0.75Fe0.25)1.85Li0.85)[Si8O22](OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.23

2

4.76

1.0079470

2.0158940
Lithium

Li

0.68

0.85

2.02

6.9412000

5.9000200
Oxygen

O

44.41

24

57.14

15.9994300

383.9863200
Sodium

Na

6.33

2.38

5.67

22.9897702

54.7156531
Magnesium

Mg

5.45

1.94

4.62

24.3050600

47.1518164
Silicon

Si

25.99

8

19.05

28.0855300

224.6842400
Potassium

K

2.80

0.62

1.48

39.0983100

24.2409522
Manganese

Mn

10.53

1.66

3.95

54.9380499

91.0598177
Iron

Fe

3.57

0.55

1.32

55.8452000

30.8544730

Strunz 9th edition incl. updates

9.DE.25

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
E: Ketten- und Bandsilikate mit 2-periodischen Doppelketten, Si4O11; Amphibol-Familie, Klinoamphibole
25:Amphibole: Alkali

Lapis Classification

VIII/F.08-120

VIII: SILIKATE
F: Ketten- und Bandsilikate
8: Zweierbänder [Si4O11] 6-; Amphibol-Gruppe; Alkali-Amphibole

Classification by Hölzel

9.DJ.760

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
J: Amphiboles; Sodic Amphiboles
7: Leakeite-Group

IMA status

anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Amphibole supergroup  ⇒ (OH,F,Cl)-dominant amphiboles  ⇒ Sodium Amphiboles  ⇒ Leakeite (Lkt) amphiboles

Optical Properties

Color

bräunlich lila, dunkelrot

Streak color

nd

Diaphaneity (Transparency)

transparent

max. Birefringence

0.042
Birefringence chart\! Potassic-mangani-leakeite title=Birefringence chart Potassic-mangani-leakeite

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

1.654

RI value β

1.675

RI value γ / ε

1.696

Ri mean

1.675

2V angle

Biaxial (+)- 90°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

9.9603(17)

Cell parameters b (Å)

17.830(3)

Cell parameters c (Å)

5.3056(9)

Cell parameters a/b or c/a

0.559

Cell parameters c/b

0.298

Cell parameters α

90°

Cell parameters β

105.275(3)°

Cell parameters γ

90°

Z

2

Volumne (ų)

908.946

Kristall structure

Rosa Micaela Danisi, Thomas Armbruster: Crystal structure of potassic-mangani-leakeite from the Wessels Mine, Kalahari Manganese Field, South Africa. European Journal of Mineralogy Vol. 29, Nr. 1 (2017) S. 143-148.

X-Ray Powder Diffraction

8.89(50),
8.43(50),
5.08(50),
4.442(50),
3.257(100),
3.132(100),
2.812(100),
2.553(100)
XRD chart Potassic-mangani-leakeite

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

Physical Properties

Density (g/cm³)

3.15 (berechnet)

3.159 ( ρ calc. Mineralienatlas )

Cleavages

parallel zu [001]

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Hotazel/Wessel's Mine (Wessels Mine)

Preface

Name from

Das Mineral trug zuerst den Namen Kornit nach Hermann Korn, geboren 1946, Deutscher Geologe. Kornite wurde als Name 2012 in Folge der Amphibol-Nomenklatur diskreditiert und umbenannt in Potassic-mangani-leakeite.

Author (Name, Year)

Armbruster & Oberhänsli & Bermanec & Dixon, 1993

References

Canadian Mineralogist 41 (2003), 1355

Rosa Micaela Danisi, Thomas Armbruster: Crystal structure of potassic-mangani-leakeite from the Wessels Mine, Kalahari Manganese Field, South Africa. European Journal of Mineralogy Vol. 29, Nr. 1 (2017) S. 143-148. First Published online on October 17, 2016

IMA group assignments

Other languages

German

Kalium-Mangani-Leakeit

Spanish

Kornita

French

Kornite

English

Potassic-mangani-leakeite

Japanese

ｺｰﾅｲﾄ

old name

German

Kornit

English

Kornite

CNMNC (IMA)-Number

IMA 1992-032

CNMNC symbol

Symbol

Pmlk

Locations with GPS information