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Cumengite Mineral Data |
General Cumengite Information |
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Cu20Pb21Cl42(OH)40•6H2O | ||
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Molecular Weight = 7,899.52 gm | ||
Copper 16.09 % Cu 20.14 % CuO | |||
Hydrogen 0.66 % H 5.93 % H2O | |||
Lead 55.08 % Pb 59.34 % PbO | |||
Chlorine 18.85 % Cl 18.85 % Cl | |||
- % Cl -4.25 % -O=Cl2 | |||
Oxygen 9.32 % O | |||
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100.00 % 100.00 % = TOTAL OXIDE | |||
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Cu20Pb21Cl42(OH)40•6(H2O) | ||
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Oxidized zone of sedimentary copper ores associated with boleite. | ||
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Valid Species (Pre-IMA) 1893 | ||
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Boleo, near Santa Rosalia, Baja California Sur. Link to MinDat.org Location Data. | ||
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Named for Edouard Cumenge (1828-1902), French mining engineer for the Boleo mines. | ||
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Cumengeite | ||
Cumengite Image | |||
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Cumengite Crystallography |
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a:c = 1:1.62204 | ||
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a = 15.1007, c = 24.494, Z = 2; V = 5,585.40 Den(Calc)= 4.70 | ||
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Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm | ||
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By Intensity(I/Io): 2.372(1), 4.83(0.9), 2.657(0.8), | ||
Physical Properties of Cumengite |
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{101} Distinct, {110} Poor | ||
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Indigo blue. | ||
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4.67 | ||
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Transparent | ||
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Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. | ||
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Epitaxial - Crystallographic alignment with a precursor mineral | ||
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Pseudo Cubic - Crystals show a cubic outline. | ||
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2.5 - Finger Nail | ||
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Adamantine | ||
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blue | ||
Optical Properties of Cumengite |
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CI meas= -0.092 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.085 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2093,KPDmeas= 0.2106,KC= 0.1929 Ncalc = 1.9 - 1.91 |
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Uniaxial (-), e=1.926, w=2.041, bire=0.1150. | ||
Calculated Properties of Cumengite |
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Bulk Density (Electron Density)=4.09 gm/cc note: Specific Gravity of Cumengite =4.70 gm/cc. |
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Fermion Index = 0.12 Boson Index = 0.88 |
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PECumengite = 981.17 barns/electron U=PECumengite x rElectron Density=4,011.66 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cumengite is Not Radioactive |
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Cumengite Classification |
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10.06.07.01 (10)Oxyhalides and Hydroxyhalides | ||
(10.06)where Am Bn (O,OH)p Xq | |||
(10.06.07)Dana Group | |||
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03.DB.20 03 - HALIDES | ||
03.D - Oxyhalides, Hydroxyhalides and Related Double Halides | |||
03.DB -With Pb, Cu, etc. | |||
Other Cumengite Information |
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NAME( Ford32) PHYS. PROP.(Dana8, AmMin v91, p1208) OPTIC PROP.(Ford32) | ||
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Links to other databases for Cumengite : 1 - Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Athena 4 - EUROmin Project 5 - Ecole des Mines de Paris 6 - GeoScienceWorld 7 - Google Images 8 - Google Scholar 9 - MinDAT 10 - Mineralienatlas (Deutsch) 11 - Online Mineral Museum 12 - QUT Mineral Atlas 13 - Ruff.Info Search for Cumengite using: Visit our Advertisers for Cumengite : Ask about Cumengite here : Print or Cut-and-Paste your Cumengite Specimen Label here :
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