Fourmarierite Mineral Data

General Fourmarierite Information

Chemical Formula:

Pb(UO2)4O3(OH)4•4(H2O)

Composition:

Molecular Weight = 1,475.40 gm

Uranium 64.53 % U 73.21 % UO₂

Hydrogen 0.82 % H 7.33 % H₂O

Lead 14.04 % Pb 15.13 % PbO

Oxygen 20.60 % O

______ ______

100.00 % 95.66 % = TOTAL OXIDE

Empirical Formula:

Pb(UO₂)₄O₃(OH)₄•4(H₂O)

Environment:

Secondary uranium-lead mineral altering from uraninite.

IMA Status:

Valid Species (Pre-IMA) 1924

Locality:

Shinkolobwe mine, Tantara, Shaba, Democratic Republic of the Congo. Link to MinDat.org Location Data.

Name Origin:

Named for Paul Fourmarier(1877-1970, Belgian geologist and Professor of Geology at the University of Liege, Belgium.

Name Pronunciation:

Fourmarierite + Pronunciation

Synonym:

ICSD 61441

PDF 13-16

Fourmarierite Image

Images:

Fourmarierite

Comments: Thick tabular orange crystals of fourmarierite.
Location: Shinkolobwe mine, Tantara, Shaba, Democratic Republic of the Congo. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Fourmarierite Crystallography

Axial Ratios:

a:b:c =0.8528:1:0.8715

Cell Dimensions:

a = 13.986, b = 16.4, c = 14.293, Z = 8; V = 3,278.39 Den(Calc)= 5.98

Crystal System:

Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Bb21m

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

By Intensity(I/I_o): 7.2(1), 3.18(0.5), 3.58(0.5),

Forms:

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Forms: ( 1 1 1) ( 1 0 1) ( 0 0 1)

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Physical Properties of Fourmarierite

Cleavage:

{001} Perfect, {100} Indistinct

Color:

Brown, Carmine red, Pink orange, Red, Reddish brown.

Density:

5.74 - 6.05, Average = 5.89

Diaphaneity:

Transparent to Translucent

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3-4 - Calcite-Fluorite

Luminescence:

Radioactive.

Luster:

Adamantine

Streak:

orange

Optical Properties of Fourmarierite

Gladstone-Dale:

CI meas= -0.286 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.268 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1499,KPDmeas= 0.1521,KC= 0.1182
Ncalc = 1.68 - 1.72

Optical Data:

Biaxial (-), a=1.85-1.865, b=1.885-1.92, g=1.89-1.97, bire=0.0400-0.1050, 2V(Calc)=40-84, 2V(Meas)=50-55. Dispersion r > v strong.

Pleochroism (x):

colorless.

Pleochroism (y):

pale amber yellow.

Pleochroism (z):

amber yellow.

Calculated Properties of Fourmarierite

Electron Density:

Bulk Density (Electron Density)=4.98 gm/cc
note: Specific Gravity of Fourmarierite =5.98 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Fourmarierite}=2,018.08 barns/electron
U=PE_{Fourmarierite} x r_electron=10044.49 barns/cc.

Radioactivity:

GRapi = 4,578,281.91 (Gamma Ray American Petroleum Institute Units)
Concentration of Fourmarierite per GRapi unit = 218.42 (PPB)

Fourmarierite 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) 6.64 ± 1.66 grams of pure Fourmarierite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 664.37 ±166.09 grams of pure Fourmarierite .

**Estimated Radioactivity from Fourmarierite** - 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 / 6.84 cm	115,513,591	3.12E-03	4,578,281.91	1,505.19
100 gm / 3.17 cm	11,551,359	3.12E-04	457,828.19	150.52
10 gm / 1.47 cm	1,155,136	3.12E-05	45,782.82	15.05
1 gm / 6.84 mm	115,514	3.12E-06	4,578.28	1.51
0.1 gm / 3.17 mm	11,551	3.12E-07	457.83	0.15
0.01 gm / 1.47 mm	1,155	3.12E-08	45.78	0.02
0.001 gm / 0.68 mm	116	3.12E-09	4.58	0.00

Weight of pure Fourmarierite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.98 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

Fourmarierite Classification

Dana Class:

05.09.02.01 (05)Oxides Containing Uranium and Thorium

(05.09)with a cation charge of 6+ containing Pb or Bi and some water of hydration or hydroxyl

(05.09.02)Dana Group

05.09.02.01 Fourmarierite Pb(UO2)4O3(OH)4•4(H2O) Bb21m mm2

Strunz Class:

04.GB.25 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.G - Uranyl Hydroxides

04.GB -With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra

04.GB.25 Fourmarierite Pb(UO2)4O3(OH)4•4(H2O) Bb21m mm2

Other Fourmarierite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Fourmarierite :
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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Fourmarierite

Pb(UO2)4O3(OH)4•4(H2O)
Dana No: 05.09.02.01 Strunz No: 04.GB.25
Locality:

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