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Kegelite

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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 2010-08-22
Locality: Tsumeb Mine / Tsumeb / Oshikoto (Otjikoto), Region / Namibia

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

Volumne (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

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Kegelite

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

monoklin : 2/m, 2, m : A2/m, A2, Am

9.EC.80

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Pyrophyllite

Al2Si4O10(OH)2

monoklin : 2/m : C2/c

VIII/H.09-010

Ferripyrophyllite

Fe3+Si2O5(OH)

monoklin : 2/m : C2/c

VIII/H.09-020

Macaulayite

(Fe3+,Al)24Si4O43(OH)2

VIII/H.09-030

Talc

Mg3Si4O10(OH)2

monoklin : 2/m : C2/c

VIII/H.09-040

Minnesotaite

Fe2+3Si4O10(OH)2

triklin : 1 : P1

VIII/H.09-050

Willemseite

(Ni,Mg)3Si4O10(OH)2

monoklin : m : Cc

VIII/H.09-060

Kegelite

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

monoklin : 2/m, 2, m : A2/m, A2, Am

VIII/H.09-070

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Latiumite

(Ca,K)4(Si,Al)5O11(SO4,CO3)

monoklin : 2 : P21

9.EA.700

Tuscanite

K(Ca,Na)6(Si,Al)10O22(SO4,CO3,(OH)2)·H2O

monoklin : 2/m : P21/a

9.EA.720

Kegelite

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

monoklin : 2/m, 2, m : A2/m, A2, Am

9.EA.730

Carletonite

KNa4Ca4Si8O18(CO3)4(OH,F)·H2O

tetragonal : 4/mmm : P4/mbm

9.EA.740

Ashcroftine-(Y)

K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8·8H2O

tetragonal : 4/mmm : I4/mmm

9.EA.760

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Kegelite

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

monoklin : 2/m, 2, m : A2/m, A2, Am

 71.05.01.01

Other languages

German

Kegelit

Spanish

Kegelita

French

Kegelite

English

Kegelite

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

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English pages

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