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Kegelite (Kegelit)

Pictures (1 Images total)

Kegelit, Siderit
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Kegelit, Siderit
weißer Kegelit mit Siderit-Kristall. Größe: 1,7 x 1,4 x 1,3 cm, Fundort: Tsumeb Mine, Tsumeb, Region Oshikoto, Namibia
Copyright: Rob Lavinsky; Contribution: thdun5
Location: Namibia/Oshikoto (Otjikoto), Region/Tsumeb/Tsumeb Mine
Mineral: Kegelite, Siderite
Image: 1282492034
Rating: 4 (votes: 2)
License: Usage for Mineralienatlas project only
Kegelit, Siderit

weißer Kegelit mit Siderit-Kristall. Größe: 1,7 x 1,4 x 1,3 cm, Fundort: Tsumeb Mine, Tsumeb, Region Oshikoto, Namibia

Copyright: Rob Lavinsky
Contribution: thdun5 2010-08-22
Locality: Tsumeb Mine / Tsumeb / Oshikoto (Otjikoto), Region / Namibia

You find additional specimen at the Geolitho Museum

Collectors Summary

Color farblos, perlweiß
Streak color weiß
Solubility +++ Säuren
Crystal System monoklin, A2/m, A2, Am

Chemism

Chemical formula

Pb4Al2Si4O10(SO4)(CO3)2(OH)4

Chemical composition

Aluminium, Blei, Silicium, Kohlenstoff, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 1439.2503644 u; Number of atoms in the formula: 41

Info

Empirical formula:

Pb4Al2Si4O10(SO4)(CO3)2(OH)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.28

4

9.76

1.0079470

4.0317880

Carbon

C

1.67

2

4.88

12.0107800

24.0215600

Oxygen

O

26.68

24

58.54

15.9994300

383.9863200

Aluminium

Al

3.75

2

4.88

26.9815382

53.9630764

Silicon

Si

7.81

4

9.76

28.0855300

112.3421200

Sulfur

S

2.23

1

2.44

32.0655000

32.0655000

Lead

Pb

57.59

4

9.76

207.2100000

828.8400000

Analysis wt%

SiO2 : 17.00, Al2O3 : 7.10, SO3 : 5.50, CO2 : 7.00, PbO : 60.90, CuO : 1.50, H2O : 2.60 (Ref: American Mineralogist 90)

Strunz 9th edition incl. updates

9.EC.80

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

Lapis Classification

VIII/H.09-070

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

Classification by Hölzel

9.EA.730

9: SILICATES
E: Phyllosilicates
A: tetragonal & pseudotetragonal Phyllosilicates
7: Tuscanite-Group

Dana 8th edition

71.05.01.01

71: Phyllosilicate Minerals
05: Phyllosilicates Phyllosilicate Sheets of Six-Membered Rings with other anions

IMA status

Neudefinition von der CNMNC anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, perlweiß

Streak color

weiß

Diaphaneity (Transparency)

transparent bis durchscheinend

RI value α / ω / n

1.81

Ri mean

1.81

2V angle

Biaxial

Crystallography

Crystal System

monoklin

Class (H-M)

2/m, 2, m

Space Group number

12, 5, 8

Space Group

A2/m, A2, Am

Cell parameters a (Å)

21.04

Cell parameters b (Å)

15.55

Cell parameters c (Å)

8.986

Cell parameters a/b or c/a

1.353

Cell parameters c/b

0.578

Cell parameters α

90°

Cell parameters β

91°

Cell parameters γ

90°

Z

6

Volume (ų)

2939.52

X-Ray Powder Diffraction

21.0(100),
7.01(50),
4.49(30),
3.82(80),
3.74(40),
3.006(50),
2.591(90),
2.339(50)

XRD chart Kegelite

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

Crystals 3D

Open larger view

Physical Properties

Density (g/cm³)

4.76 (berechnet) 4.5 (gemessen)

4.878 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Namibia/Oshikoto (Otjikoto), Region/Tsumeb/Tsumeb Mine

Preface

Name from

F.Kegel, einem ehemaligen Bergwerksdirektor in Tsumeb

Author (Name, Year)

Medenbach & Schmetzer, 1975

References

American Mineralogist 75 (1990), 702

Other languages

German

Kegelit

Spanish

Kegelita

French

Kegelite

English

Kegelite

CNMNC symbol

Symbol

Keg

Locations with GPS information

IDs

GUSID (Global unique identifier short form) goLxbkRjW027kX0sroFj-g
GUID (Global unique identifier) 6EF18282-6344-4D5B-BB91-7D2CAE8163FA
Database ID 1908