| Cumengite Mineral Data |
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- 10.6.7.1 Cumengite Pb21Cu20Cl42(OH)40 I 4/mmm 4/m 2/m 2/m
- III/D.12-10 Boleite KPb26Ag9Cu24Cl62(OH)48 P m3m 4/m 3 2/m
- III/D.12-20 Pseudoboleite Pb5Cu4Cl10(OH)8·2(H2O) I 4/mmm 4/m 2/m 2/m
- III/D.12-40 Cumengite Pb21Cu20Cl42(OH)40 I 4/mmm 4/m 2/m 2/m
- III/D.12-50 Diaboleite Pb2CuCl2(OH)4 P 4mm 4mm
- III/D.12-60 Chloroxiphite Pb3CuCl2(OH)2O2 P 21/m 2/m
- III/D.12-70 Hematophanite Pb4Fe3O8(OH,Cl) P 4mm 4mm
- III/D.12-80 Bideauxite Pb2AgCl3(F,OH)2 F d3m 4/m 3 2/m
- III/D.12-90 Yedlinite Pb6CrCl6(O,OH)8 R 3 3
General Cumengite Information |
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 Chemical Formula: |
Pb21Cu20Cl42(OH)40 | ||
| Composition: |
Molecular Weight = 7,791.43 gm | ||
| Copper 16.31 % Cu 20.42 % CuO | |||
| Hydrogen 0.52 % H 4.62 % H2O | |||
| Lead 55.85 % Pb 60.16 % PbO | |||
| Chlorine 19.11 % Cl 19.11 % Cl | |||
| - % Cl -4.31 % -O=Cl2 | |||
| Oxygen 8.21 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Pb21Cu20Cl42(OH)40 | ||
| Environment: |
Oxidized zone of sedimentary copper ores associated with boleite. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1893 | ||
| Locality: |
Boleo, near Santa Rosalia, Baja California Sur. Link to MinDat.org Location Data. | ||
| Synonym: |
Cumengeite | ||
Cumengite Image | |||
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Images:
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Cumengite Crystallography |
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| Axial Ratios: |
a:c = 1:1.62203 | ||
| Cell Dimensions: |
a = 15.065, c = 24.436, Z = 2; V = 5,545.85 Den(Calc)= 4.67 | ||
| Crystal System: |
Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.372(1), 4.83(0.9), 2.657(0.8), | ||
Physical Properties of Cumengite |
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| Cleavage: |
[101] Distinct, [110] Poor | ||
| Color: |
Indigo blue. | ||
| Density: |
4.67 | ||
| Diaphaniety: |
Transparent | ||
| Hardness: |
2.5 - Finger Nail | ||
| Luster: |
Adamantine | ||
| Streak: |
blue | ||
Optical Properties of Cumengite |
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| Gladstone-Dale: |
CI meas= -0.104 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.104 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2106,KPDmeas= 0.2106,KC= 0.1908 |
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| Optical Data: |
Uniaxial (-), e=1.926, w=2.041, bire=0.1150. | ||
Calculated Properties of Cumengite |
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| Electron Density: |
relectron=4.05 gm/cc |
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| Fermion Index |
Fermion Index = 0.12345 Boson Index = 0.87655 |
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| Photoelectric: |
PECumengite = 998.60 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cumengite is Not Radioactive |
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Cumengite Classification |
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| Dana Class: |
10.6.7.1 (10)Oxyhalides and Hydroxyhalides | ||
| (10.6)where Am Bn (O,OH)p Xq | |||
| (10.6.7)Dana Group | |||
| Strunz Class: |
III/D.12-40 III - Halogenides | ||
| III/D - Oxi-halogenides with Pb - Bi - Sb and related compounds | |||
| III/D.12 - Boleite - Yedlinite series | |||
Other Cumengite Information |
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| References: |
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) | ||
| See Also: |
Links to other databases for Cumengite : 1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 -Athena 4 - Crocoite.com Mineral Locations 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris Search for Cumengite using: Visit our Advertisers for Cumengite : AA Mineral SpecimensB & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Cumengite Mineral Data : Ask about Cumengite here : Print or Cut-and-Paste your Cumengite Specimen Label here :
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