Kegelite Mineral Data + 
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Dan Weinrich Fine Minerals
Full-time professional mineral dealer with over 31 years experience in mineral collecting
And 15 years selling mineral specimens on the internet and at major mineral shows
- 71.5.1.1 Kegelite Pb8Al4Si8O20(SO4)2(CO3)4(OH)8 A2/m,A2,Am Mono
- 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
General Kegelite Information |
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 Chemical Formula: |
Pb8Al4Si8O20(SO4)2(CO3)4(OH)8 | ||
| 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 | |||
| Empirical Formula: |
Pb8Al4Si8(SO4)2(CO3)4(OH)8O20 | ||
| Environment: |
Deep oxidation zone at the mine. | ||
| IMA Status: |
Approved IMA 1975 | ||
| Locality: |
Tsumbe, Namibia. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Friedrich Wilhelm Kegel, director of the Tsumbe mine from 1922 to 1938. | ||
Search for Kegelite Images | |||
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Images:
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Kegelite Crystallography |
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| Axial Ratios: |
a:b:c =1.353:1:0.5778 | ||
| Cell Dimensions: |
a = 21.04, b = 15.55, c = 8.986, Z = 3; beta = 91° V = 2,939.52 Den(Calc)= 4.88 | ||
| Crystal System: |
MonoclinicSpace Group: A2/m,A2,Am | ||
| X Ray Diffraction: |
By Intensity(I/Io): 21(1), 2.591(0.9), 3.82(0.8), | ||
Physical Properties of Kegelite |
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| Cleavage: |
[???] Perfect | ||
| Color: |
Colorless, Pearl white. | ||
| Density: |
4.46 - 4.549, Average = 4.5 | ||
| Diaphaniety: |
Transparent to Translucent | ||
| Luster: |
Pearly | ||
| Streak: |
white | ||
Optical Properties of Kegelite |
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| 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 |
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| Optical Data: |
Biaxial (-), b=1.81 | ||
Calculated Properties of Kegelite |
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| Electron Density: |
relectron=4.30 gm/cc |
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| Fermion Index |
Fermion Index = 0.13139 Boson Index = 0.86861 |
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| Photoelectric: |
PEKegelite =1,004.03 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Kegelite is Not Radioactive |
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Kegelite Classification |
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| Dana Class: |
71.5.1.1 (71)Phyllosilicate Sheets of Six-Membered Rings | ||
| (71.5)with other anions | |||
| (71.5.1)Dana Group | |||
| 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 | |||
Other Kegelite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| 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 Search for Kegelite using: Visit our Advertisers for Kegelite : Translate Kegelite Mineral Data : Ask about Kegelite here : Print or Cut-and-Paste your Kegelite Specimen Label here :
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