General Demesmaekerite Information
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Chemical Formula: |
Pb2Cu5(UO2)2(SeO3)6(OH)6·2(H2O) |
Composition: |
Molecular Weight = 2,172.01 gm |
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Uranium 21.92 % U 24.86 % UO2 |
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Copper 14.63 % Cu 18.31 % CuO |
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Hydrogen 0.46 % H 4.15 % H2O |
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Lead 19.08 % Pb 20.55 % PbO |
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Selenium 21.81 % Se 30.65 % SeO2 |
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Oxygen 22.10 % O |
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______ ______ |
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100.00 % 98.53 % = TOTAL OXIDE |
Empirical Formula: |
Pb2Cu5(UO2)2(SeO3)6(OH)6·2(H2O) |
Environment: |
Lower part of the oxidation zone. |
IMA Status: |
Approved IMA 1965 |
Locality: |
Musonoi mine, Kolwezi, Shaba, Zaire. Link to MinDat.org Location Data. |
Name Origin: |
Named for Gaston Demesmaeker (1911-), Belgian mining geologist, who studied the Shikolobwe uranium deposits. |
Synonym: |
ICSD 37177 |
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PDF 18-692 |
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Demesmaekerite Image |
Images:
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Demesmaekerite Malachite
Comments: Pale green crystals of demesmaekerite on dark green malachite.
Location: Musonoi Mine, Katanga, Democratic Republic of the Congo.
Scale: Crystal Size 3mm.
© John Veevaert |
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Images:
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Demesmaekerite
Comments: Tabular, light green and spear-shaped dark greenish brown demesmaekerite crystals.
Location: Musonoi mine, Kolwezi, Shaba (Katanga), Congo (Za?re).
Scale: Picture size 3 mm.
© Paul M. Schumacher |
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Demesmaekerite Crystallography
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Axial Ratios: |
a:b:c =1.1908:1:0.5617 |
Cell Dimensions: |
a = 11.955, b = 10.039, c = 5.639, Z = 1; alpha = 89.78°, beta = 100.37°, gamma = 91.33° V = 665.53 Den(Calc)= 5.42 |
Crystal System: |
Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1 |
X Ray Diffraction: |
By Intensity(I/Io): 2.97(1), 5.42(0.8), 5.89(0.6), |
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Physical Properties of Demesmaekerite
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Cleavage: |
None |
Color: |
Brown, Brownish green, Green, Bottle green. |
Density: |
5.28 |
Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
Hardness: |
3-4 - Calcite-Fluorite |
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Optical Properties of Demesmaekerite
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Gladstone-Dale: |
CI meas= -0.051 (Good) - where the CI = (1-KPDmeas/KC) CI calc= -0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.161,KPDmeas= 0.1652,KC= 0.1572 |
Optical Data: |
Biaxial (+), a=1.835, g=1.91, bire=0.0750 |
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Calculated Properties of Demesmaekerite
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Electron Density: |
relectron=4.73 gm/cc note: rDemesmaekerite =5.42 gm/cc. |
Fermion Index |
Fermion Index = 0.06042 Boson Index = 0.93958 |
Photoelectric: |
PEDemesmaekerite = 930.80 barns/electron U=PEDemesmaekerite x relectron=4,399.20 barns/cc. |
Radioactivity: |
GRapi = 1,629,107.82 (Gamma Ray American Petroleum Institute Units)
Demesmaekerite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Maximum U.S. Postal Shipping Size
(10 mRem/hr limit, Unshielded 10 cm box)
18.67 ± 4.67 grams of pure Demesmaekerite .
Estimated Maximum U.S. Postal Shipping Size
(10 mRem/hr limit, Unshielded 100 cm box)
1867.1 ±466.77 grams of pure Demesmaekerite .
Estimated Radioactivity from Demesmaekerite - very strong
Specimen Size Weight/Volume (Sphere) * |
Calculated Activity Bequerols (Bq) |
Calculated Activity Curies (Ci) |
Estimated Activity GR(api) |
Estimated Exposure (mRem**)/hr If Held in Hand For One Hour |
| 1000 gm / 7.06 cm |
39,232,952 |
1.06E-03 |
1,629,107.82 |
535.60 |
| 100 gm / 3.28 cm |
3,923,295 |
1.06E-04 |
162,910.78 |
53.56 |
| 10 gm / 1.52 cm |
392,330 |
1.06E-05 |
16,291.08 |
5.36 |
| 1 gm / 7.06 mm |
39,233 |
1.06E-06 |
1,629.11 |
0.54 |
| 0.1 gm / 3.28 mm |
3,923 |
1.06E-07 |
162.91 |
0.05 |
| 0.01 gm / 1.52 mm |
392 |
1.06E-08 |
16.29 |
0.01 |
| 0.001 gm / 0.71 mm |
39 |
1.06E-09 |
1.63 |
0.00 |
Weight of pure Demesmaekerite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.42 gm/cc.*
Goverment Estimate of Average Annual Exposure (
360 mRem)
**
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
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Demesmaekerite Classification
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Dana Class: |
34.7.6.1 (34)Selenites - Tellurites - Sulfites |
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(34.7)Dana Type |
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(34.7.6)Dana Group |
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34.7.6.1 Demesmaekerite Pb2Cu5(UO2)2(SeO3)6(OH)6·2(H2O) P1 1 |
Strunz Class: |
IV/K.11-40 IV - Oxides |
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IV/K - Uranyl-Selenides with [UO2]2+ - [SeO3]2- groups |
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IV/K.11 - Derriksite - Demesmaekerite series |
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IV/K.11-10 Derriksite Cu4(UO2)(SeO3)2(OH)6 Pn21m mm2 |
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IV/K.11-20 Marthozite Cu[(UO2)3(SeO3)2O2]·8(H2O) Pbn21 mm2 |
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IV/K.11-25 Haynesite (UO2)3(SeO3)2(OH)2·5(H2O) Pnc2,Pncm Ortho |
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IV/K.11-26 Larisaite! Na(H3O)(UO2)3(SeO3)2O2·4(H2O) Pm 2 |
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IV/K.11-28 Piretite! Ca(UO2)3(SeO3)2(OH)4-4(H2O) P mn21,Pmnm Ortho |
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IV/K.11-30 Guilleminite Ba(UO2)3(SeO3)2O2·3(H2O) P 21nm mm2 |
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IV/K.11-40 Demesmaekerite Pb2Cu5(UO2)2(SeO3)6(OH)6·2(H2O) P1 1 |
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Other Demesmaekerite Information
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References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Demesmaekerite :
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 - Uranium Minerals
13 - WWW-MINCRYST
14 -École des Mines de Paris
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Print or Cut-and-Paste your Demesmaekerite Specimen Label here :
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Demesmaekerite
Pb2Cu5(UO2)2(SeO3)6(OH)6·2(H2O)
Dana No: 34.7.6.1 Strunz No: IV/K.11-40
Locality:
Notes:
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