Kegelite Mineral Data + Say KEGELITE

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General Kegelite Information

Help on Chemical  Formula: Chemical Formula: Pb8Al4Si8O20(SO4)2(CO3)4(OH)8
Help on Composition: Composition: Molecular Weight = 2,878.42 gm
   Aluminum   3.75 %  Al    7.08 % Al2O3
   Silicon    7.81 %  Si   16.70 % SiO2
   Hydrogen   0.28 %  H     2.50 % H2O
   Lead      57.59 %  Pb   62.03 % PbO
   Carbon     1.67 %  C     6.12 % CO2
   Sulfur     2.23 %  S     5.56 % SO3
   Oxygen    26.68 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb8Al4Si8(SO4)2(CO3)4(OH)8O20
Help on Environment: Environment: Deep oxidation zone at the mine.
Help on IMA Status: IMA Status: Approved IMA 1975
Help on Locality: Locality: Tsumbe, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Friedrich Wilhelm Kegel, director of the Tsumbe mine from 1922 to 1938.
 

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Kegelite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.353:1:0.5778
Help on Cell Dimensions: Cell Dimensions: a = 21.04, b = 15.55, c = 8.986, Z = 3; beta = 91° V = 2,939.52 Den(Calc)= 4.88
Help on Crystal System: Crystal System: MonoclinicSpace Group: A2/m,A2,Am
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 21(1), 2.591(0.9), 3.82(0.8),
 

Physical Properties of Kegelite

Help on Cleavage: Cleavage: [???] Perfect
Help on Color: Color: Colorless, Pearl white.
Help on Density: Density: 4.46 - 4.549, Average = 4.5
Help on Diaphaniety: Diaphaniety: Transparent to Translucent
Help on Luster: Luster: Pearly
Help on Streak: Streak: white
 

Optical Properties of Kegelite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.102 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.166,KPDmeas= 0.1798,KC= 0.1632
Help on Optical Data: Optical Data: Biaxial (-), b=1.81
 

Calculated Properties of Kegelite

Help on Electron Density: Electron Density:

relectron=4.30 gm/cc
note: rKegelite =4.88 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.13139
Boson Index = 0.86861
Help on Photoelectric: Photoelectric:

PEKegelite =1,004.03 barns/electron
U=PEKegelite x relectron=4,316.79 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kegelite is Not Radioactive

 

Kegelite Classification

Help on  Dana Class: Dana Class: 71.5.1.1 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.5)with other anions
  (71.5.1)Dana Group
 
71.5.1.1 Kegelite Pb8Al4Si8O20(SO4)2(CO3)4(OH)8 A2/m,A2,Am Mono
Help on  Strunz Class: Strunz Class: VIII/H.09-70 VIII - Silicates
  VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups
  VIII/H.09 - Talc series
 
VIII/H.09-10 Pyrophyllite Al2Si4O10(OH)2 P1 1
 
VIII/H.09-20 Ferripyrophyllite Fe2Si4O10(OH)2 C 2/m 2/m
 
VIII/H.09-30 Macaulayite (Fe,Al)24Si4O43(OH)2 C? Mono
 
VIII/H.09-40 Talc Mg3Si4O10(OH)2 C 2/c 2/m
 
VIII/H.09-50 Minnesotaite (Fe,Mg)3Si4O10(OH)2 C1 1
 
VIII/H.09-60 Willemseite (Ni,Mg)3Si4O10(OH)2 C 2/c 2/m
 
VIII/H.09-65 Pimelite Ni3Si4O10(OH)2·4(H2O) Unk. Hex
 
VIII/H.09-70 Kegelite Pb8Al4Si8O20(SO4)2(CO3)4(OH)8 A2/m,A2,Am Mono
 

Other Kegelite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Kegelite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 -École des Mines de Paris

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Print or Cut-and-Paste your Kegelite Specimen Label here :

Kegelite

Pb8Al4Si8O20(SO4)2(CO3)4(OH)8
Dana No: 71.5.1.1 Strunz No: VIII/H.09-70
Locality:

 

Notes:

 

 
   
 
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