Gebhardite Mineral Data + 
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- 46.2.5.1 Gebhardite Pb8(As2O5)2OCl6 P 21/c 2/m
- IV/J.11-10 Paulmooreite Pb2As2O5 P 21 2
- IV/J.11-20 Gebhardite Pb8(As2O5)2OCl6 P 21/c 2/m
General Gebhardite Information |
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 Chemical Formula: |
Pb8(As+++2O5)2OCl6 | ||
| Composition: |
Molecular Weight = 2,346.00 gm | ||
| Arsenic 12.77 % As 16.87 % As2O3 | |||
| Lead 70.66 % Pb 76.11 % PbO | |||
| Chlorine 9.07 % Cl 9.07 % Cl | |||
| - % Cl -2.05 % -O=Cl2 | |||
| Oxygen 7.50 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Pb8As4O11Cl6 | ||
| IMA Status: |
Approved IMA 1983 | ||
| Locality: |
Link to MinDat.org Location Data. | ||
| Synonym: |
ICSD 40343 | ||
| PDF 36-611 | |||
Search for Gebhardite Images | |||
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Images:
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Gebhardite Crystallography |
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| Axial Ratios: |
a:b:c =0.6003:1:3.0526 | ||
| Cell Dimensions: |
a = 6.724, b = 11.2, c = 34.19, Z = 4; beta = 85.2° V = 2,565.78 Den(Calc)= 6.07 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c | ||
| X Ray Diffraction: |
By Intensity(I/Io): 6.7(1), 3.68(0.8), 3.72(0.8), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Gebhardite |
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| Cleavage: |
[001] Perfect, [010] Good | ||
| Color: |
Light brown. | ||
| Density: |
6 | ||
| Diaphaniety: |
Transparent | ||
| Hardness: |
3 - Calcite | ||
| Luster: |
Adamantine | ||
| Streak: |
white | ||
Optical Properties of Gebhardite |
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| Gladstone-Dale: |
CI meas= -0.081 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.069 (Fair) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1812,KPDmeas= 0.1833,KC= 0.1695 |
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| Optical Data: |
Biaxial (-), a=2.08, g=2.12, bire=0.0400 | ||
Calculated Properties of Gebhardite |
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| Electron Density: |
relectron=5.06 gm/cc |
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| Fermion Index |
Fermion Index = 0.15618 Boson Index = 0.84382 |
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| Photoelectric: |
PEGebhardite =1,311.50 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Gebhardite is Not Radioactive |
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Gebhardite Classification |
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| Dana Class: |
46.2.5.1 (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites | ||
| (46.2)with miscellaneous formulae | |||
| (46.2.5)Dana Group | |||
| Strunz Class: |
IV/J.11-20 IV - Oxides | ||
| IV/J - Arsenides with [As2O5]4- groups | |||
| IV/J.11 - Paulmooreite - Gebhardite series | |||
Other Gebhardite Information |
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| References: |
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Gebhardite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris Search for Gebhardite using: Visit our Advertisers for Gebhardite : Translate Gebhardite Mineral Data : Ask about Gebhardite here : Print or Cut-and-Paste your Gebhardite Specimen Label here :
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