Derriksite Mineral Data

Derriksite Mineral Data +

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General Derriksite Information

Chemical Formula:

Cu4(UO2)(SeO3)2(OH)6

Composition:

Molecular Weight = 880.17 gm

Uranium 27.04 % U 30.68 % UO₂

Copper 28.88 % Cu 36.15 % CuO

Hydrogen 0.69 % H 6.14 % H₂O

Selenium 17.94 % Se 25.21 % SeO₂

Oxygen 25.45 % O

______ ______

100.00 % 98.18 % = TOTAL OXIDE

Empirical Formula:

Cu₄(UO₂)(SeO₃)₂(OH)₆

IMA Status:

Approved IMA 1971

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 38076

PDF 25-319

Derriksite Image

Images:

Derriksite

Comments: Light blue crystalline aggregates of derriksite.
Location: Musonoi mine, Kolwezi, Shaba, Democratic Republic of the Congo. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Derriksite Crystallography

Axial Ratios:

a:b:c =0.2918:1:0.3125

Cell Dimensions:

a = 5.57, b = 19.088, c = 5.965, Z = 2; V = 634.20 Den(Calc)= 4.61

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pn21m

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

By Intensity(I/I_o): 4.78(1), 3.748(0.8), 4.072(0.8),

Physical Properties of Derriksite

Cleavage:

[???] Perfect, [010] Good

Color:

Bottle green, Green.

Density:

4.72

Diaphaniety:

Translucent

Optical Properties of Derriksite

Gladstone-Dale:

CI meas= -0.093 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.119 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1815,KPDmeas= 0.1773,KC= 0.1622

Optical Data:

Biaxial (-), a=1.77, b=1.85, g=1.89, bire=0.1200

Calculated Properties of Derriksite

Electron Density:

r_electron=4.23 gm/cc
note: r_Derriksite=4.72 gm/cc.

Fermion Index

Fermion Index = 0.0157
Boson Index = 0.9843

Photoelectric:

PE_Derriksite= 713.01 barns/electron
U=PE_Derriksite x r_electron=3,012.99 barns/cc.

Radioactivity:

GRapi = 2,063,735.85 (Gamma Ray American Petroleum Institute Units)

Derriksite 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) 14.74 ± 3.68 grams of pure Derriksite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1473.9 ±368.47 grams of pure Derriksite .

**Estimated Radioactivity from Derriksite** - 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 / 7.40 cm	48,407,758	1.31E-03	2,063,735.85	678.49
100 gm / 3.43 cm	4,840,776	1.31E-04	206,373.58	67.85
10 gm / 1.59 cm	484,078	1.31E-05	20,637.36	6.78
1 gm / 7.40 mm	48,408	1.31E-06	2,063.74	0.68
0.1 gm / 3.43 mm	4,841	1.31E-07	206.37	0.07
0.01 gm / 1.59 mm	484	1.31E-08	20.64	0.01
0.001 gm / 0.74 mm	48	1.31E-09	2.06	0.00

Weight of pure Derriksite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.72 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

Derriksite Classification

Dana Class:

34.7.5.1 (34)Selenites - Tellurites - Sulfites

(34.7)Dana Type

(34.7.5)Dana Group

34.7.5.1 Derriksite Cu4(UO2)(SeO3)2(OH)6 Pn21m mm2

Strunz Class:

IV/K.11-10 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 Derriksite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Derriksite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - Uranium Minerals 12 - WWW-MINCRYST

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Derriksite

Cu4(UO2)(SeO3)2(OH)6
Dana No: 34.7.5.1 Strunz No: IV/K.11-10
Locality:

Notes: