Marthozite Mineral Data

Marthozite Mineral Data +

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General Marthozite Information

Chemical Formula:

Cu[(UO2)3(SeO3)2O2]·8(H2O)

Composition:

Molecular Weight = 1,303.67 gm

Uranium 54.78 % U 62.14 % UO₂

Copper 4.87 % Cu 6.10 % CuO

Hydrogen 1.24 % H 11.06 % H₂O

Selenium 12.11 % Se 17.02 % SeO₂

Oxygen 27.00 % O

______ ______

100.00 % 96.32 % = TOTAL OXIDE

Empirical Formula:

Cu(UO₂)₃(SeO₃)₂(O)₂·8(H₂O)

Environment:

In cavities in selenian digenite. Dehydrates in air to (H2O)6.

IMA Status:

Approved IMA 1969

Locality:

Musonoi mine, Kolwezi, Shaba, Zaire. Link to MinDat.org Location Data.

Name Origin:

Named for Aime Marthoz (1864-1962), French mineralogist and inspector General, Bureau de Recherches Geolgiques et Miniere.

Marthozite Image

Images:

Marthozite

Comments: Yellowish green coating of marthozite on matrix.
Location: Musonoi Mine, Katanga, Democratic Republic of the Congo. Scale: Not Given.
© John Veevaert

Images:

Marthozite

Comments: Olive green crystal of marthozite showing multiple face development on main crystal. Schumacher Collection.
Location: Musonoi Mine, Kolwezi, Western area, Shaba Cu belt, Shaba (Katanga), Congo (Za?re). Scale: Picture size 5 mm.
© Paul M. Schumacher

Marthozite Crystallography

Axial Ratios:

a:b:c =0.4247:1:1.0467

Cell Dimensions:

a = 6.9879, b = 16.4537, c = 17.2229, Z = 4; V = 1,980.23 Den(Calc)= 4.37

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pbn21

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

By Intensity(I/I_o): 3.09(1), 8.23(1), 3.22(0.8),

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Crystal Structure:

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Cooper M A , Hawthorne F C , The Canadian Mineralogist , 39 (2001) p.797-807, Structure topology and hydrogen bonding in mathozite, Cu[(UO2)3(SeO3)2O2](H2O)8,, a comparison with guilleminite, Ba[(UO2)3(SeO3)2O2](H2O)3

Physical Properties of Marthozite

Cleavage:

[100] Perfect, [010] Indistinct

Color:

Greenish brown, Yellow green.

Density:

4.44

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Hardness:

6 - Orthoclase

Optical Properties of Marthozite

Gladstone-Dale:

CI meas= -0.23 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.25 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1791,KPDmeas= 0.1762,KC= 0.1433

Optical Data:

Biaxial (-), b=1.78-1.785, g=1.78-1.785, , 2V(Meas)=37-42.

Pleochroism (x):

yellowish brown.

Pleochroism (y):

greenish yellow.

Pleochroism (z):

greenish yellow.

Calculated Properties of Marthozite

Electron Density:

r_electron=3.85 gm/cc
note: r_Marthozite=4.44 gm/cc.

Fermion Index

Fermion Index = 0.01328
Boson Index = 0.98672

Photoelectric:

PE_Marthozite=1,445.94 barns/electron
U=PE_Marthozite x r_electron=5,564.74 barns/cc.

Radioactivity:

GRapi = 4,046,969.06 (Gamma Ray American Petroleum Institute Units)

Marthozite 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) 7.52 ± 1.88 grams of pure Marthozite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 751.59 ±187.90 grams of pure Marthozite .

**Estimated Radioactivity from Marthozite** - 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 / 7.55 cm	98,047,698	2.65E-03	4,046,969.06	1,330.51
100 gm / 3.50 cm	9,804,770	2.65E-04	404,696.91	133.05
10 gm / 1.63 cm	980,477	2.65E-05	40,469.69	13.31
1 gm / 7.55 mm	98,048	2.65E-06	4,046.97	1.33
0.1 gm / 3.50 mm	9,805	2.65E-07	404.70	0.13
0.01 gm / 1.63 mm	980	2.65E-08	40.47	0.01
0.001 gm / 0.75 mm	98	2.65E-09	4.05	0.00

Weight of pure Marthozite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.44 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

Marthozite Classification

Dana Class:

34.7.4.1 (34)Selenites - Tellurites - Sulfites

(34.7)Dana Type

(34.7.4)Dana Group

34.7.4.1 Marthozite Cu[(UO2)3(SeO3)2O2]·8(H2O) Pbn21 mm2

Strunz Class:

IV/K.11-20 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 Marthozite Information

References:

NAME( Dana8) PHYS. PROP.(AmMin, Vol 87, p 358) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Marthozite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - Uranium Minerals 12 -École des Mines de Paris

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Marthozite

Cu[(UO2)3(SeO3)2O2]·8(H2O)
Dana No: 34.7.4.1 Strunz No: IV/K.11-20
Locality:

Notes: