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Kegelite Mineral Data

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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.
Help on Name Pronunciation: Name Pronunciation: Kegelite Say KEGELITE

Kegelite Image

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Comments: Small, transparent pseudo-cubic kegelite crystals.
Location: Tsumbe, Namibia.. Scale: See Image.
© William Pinch

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: Monoclinic Space 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 Diaphaneity: Diaphaneity: 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
Ncalc = 1.73 - 1.8
Help on Optical Data: Optical Data: Biaxial (-), b=1.81

Calculated Properties of Kegelite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.30 gm/cc
note: Specific Gravity of Kegelite =4.88 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.13
Boson Index = 0.87
Help on Photoelectric: Photoelectric: PEKegelite =1,004.03 barns/electron
U=PEKegelite x rElectron Density=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)Phyllosilicate Sheets of Six-Membered Rings
  (71.05)with other anions
  (71.05.01)Dana Group Kegelite Pb8Al4Si8O20(SO4)2(CO3)4(OH)8 A2/m,A2,Am Mono
Help on  Strunz Class: Strunz Class: 09.EC.80 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
09.EC.80 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 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.EC.80





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