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Demesmaekerite Mineral Data

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General Demesmaekerite Information

Help on Chemical  Formula: Chemical Formula: Pb2Cu5(UO2)2(SeO3)6(OH)6•2(H2O)
Help on Composition: Composition: Molecular Weight = 2,172.01 gm
   Uranium   21.92 %  U    24.86 % UO2
   Copper    14.63 %  Cu   18.31 % CuO
   Hydrogen   0.46 %  H     4.15 % H2O
   Lead      19.08 %  Pb   20.55 % PbO
   Selenium  21.81 %  Se   30.65 % SeO2
   Oxygen    22.10 %  O
            ______        ______ 
            100.00 %       98.53 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb2Cu5(UO2)2(SeO3)6(OH)6•2(H2O)
Help on Environment: Environment: Lower part of the oxidation zone.
Help on IMA Status: IMA Status: Approved IMA 1965
Help on Locality: Locality: Musonoi mine, Kolwezi, Shaba, Zaire. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Gaston Demesmaeker (1911-), Belgian mining geologist, who studied the Shikolobwe uranium deposits.
Help on Name Pronunciation: Name Pronunciation: Demesmaekerite + Pronunciation Say DEMESMAEKERITE
Help on Synonym: Synonym: ICSD 37177
  PDF 18-692
 

Demesmaekerite Image

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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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  Demesmaekerite

Comments: Tabular, light green and spear-shaped dark greenish brown demesmaekerite crystals.
Location: Musonoi mine, Kolwezi, Shaba (Katanga), Congo (Zaïre). Scale: Picture size 3 mm.
© Paul M. Schumacher

Demesmaekerite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.1908:1:0.5617
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.97(1), 5.42(0.8), 5.89(0.6),
 

Physical Properties of Demesmaekerite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Brownish green, Green, Bottle green.
Help on Density: Density: 5.28
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
 

Optical Properties of Demesmaekerite

Help on Gladstone-Dale: 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
Ncalc = 1.83 - 1.85
Help on Optical Data: Optical Data: Biaxial (+), a=1.835, g=1.91, bire=0.0750
 

Calculated Properties of Demesmaekerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.73 gm/cc
note: Specific Gravity of Demesmaekerite =5.42 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEDemesmaekerite = 930.80 barns/electron
U=PEDemesmaekerite x relectron=4,399.20 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 1,629,108.74 (Gamma Ray American Petroleum Institute Units)
Concentration of Demesmaekerite per GRapi unit = 613.83 (PPB)

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 39,232,958 1.06E-03 1,629,108.74 535.60
100 gm / 3.28 cm 3,923,296 1.06E-04 162,910.87 53.56
10 gm / 1.52 cm 392,330 1.06E-05 16,291.09 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
 

Demesmaekerite Classification

Help on  Dana Class: Dana Class: 34.07.06.01 (34)Selenites - Tellurites - Sulfites
  (34.07)Dana Type
  (34.07.06)Dana Group
 
34.07.06.01 Demesmaekerite Pb2Cu5(UO2)2(SeO3)6(OH)6•2(H2O) P1 1
Help on  Strunz Class: Strunz Class: 04.JJ.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JJ -Selenites with additional anions, with H2O
 
04.JJ.20 Demesmaekerite Pb2Cu5(UO2)2(SeO3)6(OH)6•2(H2O) P1 1
 

Other Demesmaekerite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Demesmaekerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals
16 - WWW-MINCRYST

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Print or Cut-and-Paste your Demesmaekerite Specimen Label here :

Demesmaekerite

Pb2Cu5(UO2)2(SeO3)6(OH)6•2(H2O)
Dana No: 34.07.06.01 Strunz No: 04.JJ.20
Locality:

 

Notes:

 

 
   
 


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