Demesmaekerite Mineral Data

Demesmaekerite Mineral Data +

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General Demesmaekerite Information

Chemical Formula:

Pb2Cu5(UO2)2(SeO3)6(OH)6·2(H2O)

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

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

PDF 18-692

Demesmaekerite Image

Images:

Click Here for Larger Demesmaekerite Image

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

Images:

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

Demesmaekerite Crystallography

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.97(1), 5.42(0.8), 5.89(0.6),

Physical Properties of Demesmaekerite

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

Optical Properties of Demesmaekerite

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

Calculated Properties of Demesmaekerite

Electron Density:

r_electron=4.73 gm/cc
note: r_{Demesmaekerite}=5.42 gm/cc.

Fermion Index

Fermion Index = 0.06042
Boson Index = 0.93958

Photoelectric:

PE_{Demesmaekerite}= 930.80 barns/electron
U=PE_{Demesmaekerite} x r_electron=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

Demesmaekerite Classification

Dana Class:

34.7.6.1 (34)Selenites - Tellurites - Sulfites

(34.7)Dana Type

(34.7.6)Dana Group

34.7.6.1 Demesmaekerite Pb2Cu5(UO2)2(SeO3)6(OH)6·2(H2O) P1 1

Strunz Class:

IV/K.11-40 IV - Oxides

IV/K - Uranyl-Selenides with [UO2]2+ - [SeO3]2- groups

IV/K.11 - Derriksite - Demesmaekerite series

IV/K.11-10 Derriksite Cu4(UO2)(SeO3)2(OH)6 Pn21m mm2

IV/K.11-20 Marthozite Cu[(UO2)3(SeO3)2O2]·8(H2O) Pbn21 mm2

IV/K.11-25 Haynesite (UO2)3(SeO3)2(OH)2·5(H2O) Pnc2,Pncm Ortho

IV/K.11-26 Larisaite! Na(H3O)(UO2)3(SeO3)2O2·4(H2O) Pm 2

IV/K.11-28 Piretite! Ca(UO2)3(SeO3)2(OH)4-4(H2O) P mn2₁,Pmnm Ortho

IV/K.11-30 Guilleminite Ba(UO2)3(SeO3)2O2·3(H2O) P 2₁nm mm2

IV/K.11-40 Demesmaekerite Pb2Cu5(UO2)2(SeO3)6(OH)6·2(H2O) P1 1

Other Demesmaekerite Information

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 :

Demesmaekerite

Pb2Cu5(UO2)2(SeO3)6(OH)6·2(H2O)
Dana No: 34.7.6.1 Strunz No: IV/K.11-40
Locality:

Notes: