Fourmarierite Mineral Data

Fourmarierite Mineral Data +

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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.

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 - PyramidalH-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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Crystal Structure:

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Li Y , Burns P C , The Canadian Mineralogist , 38 (2000) p.737-749, Investigations of crystal-chemical variability in lead uranyl oxide, hydrates. II. Fourmarierite, Note: sample CMCNC 81096, Locality: Shinkolobwe, Democratic Republic of Congo

View Additional jPOWD Structure files for Fourmarierite
[1] [10] [11] [12] [2] [3] [4] [5] [6] [7] [8] [9]

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

Diaphaniety:

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

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:

r_electron=4.98 gm/cc
note: r_{Fourmarierite}=5.98 gm/cc.

Fermion Index

Fermion Index = 0.03578
Boson Index = 0.96422

Photoelectric:

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

Radioactivity:

GRapi = 4,578,280.35 (Gamma Ray American Petroleum Institute Units)

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	115,513,587	3.12E-03	4,578,280.35	1,505.19
100 gm / 3.17 cm	11,551,359	3.12E-04	457,828.04	150.52
10 gm / 1.47 cm	1,155,136	3.12E-05	45,782.80	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:

5.9.2.1 (5)Oxides Containing Uranium and Thorium

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

(5.9.2)Dana Group

5.9.2.1 Fourmarierite Pb(UO2)4O3(OH)4·4(H2O) Bb21m mm2

Strunz Class:

IV/H.07-10 IV - Oxides

IV/H - Uranyl ([UO2]2+) hydroxides and hydrates

IV/H.07 - Fourmarierite - Masuyite series

IV/H.07-10 Fourmarierite Pb(UO2)4O3(OH)4·4(H2O) Bb21m mm2

IV/H.07-20 Vandendriesscheite Pb(UO2)10O6(OH)11·11(H2O) P bca 2/m 2/m 2/m

IV/H.07-30 Metavandendriesscheite PbU7O22·n(H2O)(n<12) Pmma,Pm2a Ortho

IV/H.07-40 Sayrite Pb2(UO2)5O6(OH)2·4(H2O) P 2₁/c 2/m

IV/H.07-45 Spriggite! Pb3[(UO2)6O8(OH)2](H2O)x;x~3 C 2/c 2/m

IV/H.07-50 Curite Pb3x(H2O)2[(UO2)4x(OH)3-x]2,x~0.5 Pnam 2/m 2/m 2/m

IV/H.07-60 Richetite PbU4O13·4(H2O) P1 or P1 Tri

IV/H.07-70 Masuyite Pb[(UO2)3O3(OH)2]·3(H2O) Pn m

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 -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 Fourmarierite Specimen Label here :

Fourmarierite

Pb(UO2)4O3(OH)4·4(H2O)
Dana No: 5.9.2.1 Strunz No: IV/H.07-10
Locality:

Notes: