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Melanotekite (Melanotekit)

Pictures (4 Images total)

Alamosit, Melanotekit, Leadhillit
Views (File:
1282490763
): 3370
Alamosit, Melanotekit, Leadhillit
Alamosit (weiß) neben Melanotekit (schwarz) und farblosem Leadhillit. Größe: 3,5 x 2,5 x 1,5 cm, Fundort: Tsumeb Mine, Tsumeb, Region Oshikoto, Namibia
Copyright: Rob Lavinsky; Contribution: thdun5
Location: Namibia/Oshikoto (Otjikoto), Region/Tsumeb/Tsumeb Mine
Mineral: Alamosite, Leadhillite, Melanotekite
Image: 1282490763
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Alamosit, Melanotekit, Leadhillit

Alamosit (weiß) neben Melanotekit (schwarz) und farblosem Leadhillit. Größe: 3,5 x 2,5 x 1,5 cm, Fundort: Tsumeb Mine, Tsumeb, Region Oshikoto, Namibia
Copyright: Rob Lavinsky
Contribution: thdun5 2010-08-22
Locality: Tsumeb Mine / Tsumeb / Oshikoto (Otjikoto), Region / Namibia
Melanotekit in Anglesit
Views (File:
1282601182
): 1127
Melanotekit in Anglesit
Bildbreite: 40 mm; Fundort: Tsumeb Mine, Otjikoto Region, Namibia
Copyright: Andrew Tuma; Contribution: Philip Blümner
Location: Namibia/Oshikoto (Otjikoto), Region/Tsumeb/Tsumeb Mine
Mineral: Melanotekite
Image: 1282601182
License: Usage for Mineralienatlas project only
Melanotekit in Anglesit

Bildbreite: 40 mm; Fundort: Tsumeb Mine, Otjikoto Region, Namibia
Copyright: Andrew Tuma
Contribution: Philip Blümner 2010-08-23
Locality: Tsumeb Mine / Tsumeb / Oshikoto (Otjikoto), Region / Namibia
Melanotekit
Views (File:
1283687466
): 1031
Melanotekit
Größe: 5,4 x 4,7 x 2,4 cm, Fundort: Långban, Filipstad, Värmland, Schweden
Copyright: Rob Lavinsky; Contribution: thdun5
Location: Schweden/Värmland, Provinz/Filipstad, Gemeinde/Långban, Distrikt/Långban Fe-Mn-(Ba-As-Pb-Sb) Lagerstätte
Mineral: Melanotekite
Image: 1283687466
License: Usage for Mineralienatlas project only
Melanotekit

Größe: 5,4 x 4,7 x 2,4 cm, Fundort: Långban, Filipstad, Värmland, Schweden
Copyright: Rob Lavinsky
Contribution: thdun5 2010-09-05
Locality: Långban Fe-Mn-(Ba-As-Pb-Sb) Lagerstätte / Långban, Distrikt / Filipstad, Gemeinde / Värmland, Provinz / Schweden
Melanotekit
Views (File:
1535646329
): 545
Melanotekit
BB- 3 mm- braun-Deutschland/Nordrhein-Westfalen/Arnsberg, Bezirk/Märkischer Kreis/Iserlohn/Letmathe/Genna Zinkhütte
Copyright: Hannes Osterhammer; Contribution: anatase2
Collection: Lithothek der Münchener Micromounter, Collection number: A041694, Donator: anatase2
Location: Deutschland/Nordrhein-Westfalen/Arnsberg, Bezirk/Märkischer Kreis/Iserlohn/Letmathe/Genna Zinkhütte
Mineral: Melanotekite
Image: 1535646329
License: Creative Commons - Attribution-Noncommercial-Share Alike (CC-BY-NC-SA) V.3.0
Melanotekit (SNr: A041694)

BB- 3 mm- braun-Deutschland/Nordrhein-Westfalen/Arnsberg, Bezirk/Märkischer Kreis/Iserlohn/Letmathe/Genna Zinkhütte
Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: anatase2 2018-08-30
Locality: Genna Zinkhütte / Letmathe / Iserlohn / Märkischer Kreis / Arnsberg, Bezirk / Nordrhein-Westfalen / Deutschland

You find additional specimen at the Geolitho Museum

Collectors Summary

Color schwarz, schwärzlich grau
Streak color grünlich
Hardness (Mohs) 6.5
Solubility +++ HF, Königswasser, ++ HNO3
Crystal System orthorhombisch, Pbcn

Chemism

Chemical formula

Pb2Fe23+Si2O9

Chemical composition

Blei, Eisen, Silicium, Sauerstoff

Unit weight: 726.27633 u; Number of atoms in the formula: 15

Info

Empirical formula:

Pb2Fe2Si2O9

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

19.83

9

60.00

15.9994300

143.9948700
Silicon

Si

7.73

2

13.33

28.0855300

56.1710600
Iron

Fe

15.38

2

13.33

55.8452000

111.6904000
Lead

Pb

57.06

2

13.33

207.2100000

414.4200000

Analysis wt%

SiO2 : 17.22, PbO : 58.42, Fe2O3 : 22.81, Mn2O3 : 0.63 (Ref: American Mineralogist 67)

Strunz 9th edition incl. updates

9.BE.80

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
E: Si2O7 Gruppen mit zusätzlichen Anionen; Kationen in oktahedraler [6] und größerer Koordination
80:Kentrolith-Gruppe

Lapis Classification

VIII/C.20-010

VIII: SILIKATE
C: Gruppensilikate
20: Gruppensilikate [Si2O7] 6-, mit tetraederfremden Anionen (O,OH,F)

Classification by Hölzel

9.BM.100

9: SILICATES
B: Sorosilicates
M: Melanotekite-Group

Dana 8th edition

56.02.10.01

56: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O
02: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O with cations in [4] and/or >[4] coordination
10: Melanotekite group

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

schwarz, schwärzlich grau

Streak color

grünlich

Diaphaneity (Transparency)

teilweise durchscheinend bis opak

max. Birefringence

0.19
Birefringence chart\! Melanotekite title=Birefringence chart Melanotekite

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

2.12

RI value β

2.17

RI value γ / ε

2.31

Ri mean

2.20

2V angle

Biaxial (+) 67°

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

60

Space Group

Pbcn

Cell parameters a (Å)

6.992

Cell parameters b (Å)

11.022

Cell parameters c (Å)

10.054

Cell parameters a/b or c/a

0.634

Cell parameters c/b

0.912

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

774.82

X-Ray Powder Diffraction

5.56(70),
3.71(80),
3.51(80),
3.24(80),
2.90(100),
2.86(100),
2.84(80),
2.73(100)
XRD chart Melanotekite

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)

6.5

VHN (Hardness Vickers)

960 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

5.73

6.226 ( ρ calc. Mineralienatlas )

Instability

+++ HF, Königswasser, ++ HNO3

(Co-)Type locality

(Co-)Type locality

Schweden/Värmland, Provinz/Filipstad, Gemeinde/Långban, Distrikt/Långban Fe-Mn-(Ba-As-Pb-Sb) Lagerstätte

Preface

Author (Name, Year)

Lindström, 1880

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 533

Other languages

German

Melanotekit

French

Melanotekite

English

Melanotekite

Spanish

Melanotequita

Russian

Меланотекит

Japanese

ﾒﾗﾉﾃｯｸ鉱

Alternative Name

German

Melanotecit

Spanish

Melanotecita

Melanotecite

Spanish

Melanotekita

CNMNC symbol

Symbol

Mtk

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 9xXUQakJtkuPW4h6t3Y_GA
GUID (Global unique identifier) 41D415F7-09A9-4BB6-8F5B-887AB7763F18
Database ID 2452