Derriksite Mineral Data

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

Environment:

Oxidized portions of a selenium-bearing Cuï¿½Co deposit.

IMA Status:

Approved IMA 1971

Locality:

Musonoi Cu-Co mine, near Kolwezi, Katanga Province, Congo (Shaba Province, Zaire). Link to MinDat.org Location Data.

Name Origin:

Named for Jean Marie Francois Joseph Derriks (1912-1993), Belgian geologist who studied the Shinkolobwe uranium deposit.

Name Pronunciation:

Derriksite + Pronunciation

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 - Pyramidal H-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

Diaphaneity:

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
Ncalc = 1.75 - 1.77

Optical Data:

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

Calculated Properties of Derriksite

Electron Density:

Bulk Density (Electron Density)=4.23 gm/cc
note: Specific Gravity of Derriksite =4.72 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

Radioactivity:

GRapi = 2,063,737.27 (Gamma Ray American Petroleum Institute Units)
Concentration of Derriksite per GRapi unit = 484.56 (PPB)

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	48,407,773	1.31E-03	2,063,737.27	678.49
100 gm / 3.43 cm	4,840,777	1.31E-04	206,373.73	67.85
10 gm / 1.59 cm	484,078	1.31E-05	20,637.37	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:

34.07.05.01 (34)Selenites - Tellurites - Sulfites

(34.07)Dana Type

(34.07.05)Dana Group

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

Strunz Class:

04.JG.30 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.J - Arsenites, Antimonites, Bismuthites, Sulfites,

04.JG -Selenites with additional anions, without H2O

04.JG.30 Derriksite Cu4(UO2)(SeO3)2(OH)6 Pn21m mm2

Other Derriksite Information

References:

NAME( AntBidBlaNic5) 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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - Uranium Minerals
14 - WWW-MINCRYST

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Derriksite

Cu4(UO2)(SeO3)2(OH)6
Dana No: 34.07.05.01 Strunz No: 04.JG.30
Locality:

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