Mineralogy Database

Masuyite Mineral Data

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General Masuyite Information

Help on Chemical  Formula: Chemical Formula: Pb[(UO2)3O3(OH)2]•3(H2O)
Help on Composition: Composition: Molecular Weight = 1,153.34 gm
   Uranium   61.91 %  U    70.24 % UO2
   Hydrogen   0.70 %  H     6.25 % H2O
   Lead      17.97 %  Pb   19.35 % PbO
   Oxygen    19.42 %  O
            ______        ______ 
            100.00 %       95.84 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb(UO2)3O3(OH)2•3(H2O)
Help on Environment: Environment: Crystals lining cavities in uraninite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1947
Help on Locality: Locality: Shinkolobwe uranium mine, Shaba Province, Democratic Republic of Congo. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Gustave Masuy (1905-1945), Belgian geologist, shot by the German occupiers at the end of World War II.
Help on Name Pronunciation: Name Pronunciation: Masuyite Say MASUYITE
Help on Synonym: Synonym: ICSD 87743
  PDF 51-1575

Masuyite Image

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

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Comments: Dark reddish brown aggregate of masuyite with green metatorbernite on matrix.
Location: Musonoi mine, Kolwezi, Shaba, (Katanga), Congo (Zaïre). Scale: Picture size 2 mm.
© Paul M. Schumacher

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  Metavandendriesscheite   Masuyite

Comments: Botryoidal crusts of orange metavandendriesscheite with red- to yellow-brown prismatic masyuite.
Location: Giftkiesstollen, Jachymov, Bohemia, Czech Republic. Scale: Not Given.
© Diederik Visser

Masuyite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7467:1:0.9964
Help on Cell Dimensions: Cell Dimensions: a = 12.241, b = 7.008, c = 6.983, Z = 2; beta = 90.402° V = 599.02 Den(Calc)= 6.39
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Pn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.08(1), 3.52(0.7), 3.12(0.5),

Physical Properties of Masuyite

Help on Cleavage: Cleavage: {001} Perfect, {010} Indistinct
Help on Color: Color: Brown orange, Carmine red, Red, Red orange.
Help on Density: Density: 5.08
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Masuyite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.453 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.155 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1354,KPDmeas= 0.1703,KC= 0.1172
Ncalc = 1.6 - 1.75
Help on Optical Data: Optical Data: Biaxial (-), a=1.785, b=1.895, g=1.915, bire=0.1300, 2V(Calc)=44, 2V(Meas)=50.

Calculated Properties of Masuyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.30 gm/cc
note: Specific Gravity of Masuyite =6.39 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEMasuyite =2,027.37 barns/electron
U=PEMasuyite x relectron=10738.25 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,374,480.57 (Gamma Ray American Petroleum Institute Units)
Concentration of Masuyite per GRapi unit = 228.60 (PPB)

Masuyite 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) 6.95 ± 1.74 grams of pure Masuyite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 695.32 ±173.83 grams of pure Masuyite .

Estimated Radioactivity from Masuyite - very strong
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 6.69 cm 110,827,091 3.00E-03 4,374,480.57 1,438.19
100 gm / 3.10 cm 11,082,709 3.00E-04 437,448.06 143.82
10 gm / 1.44 cm 1,108,271 3.00E-05 43,744.81 14.38
1 gm / 6.69 mm 110,827 3.00E-06 4,374.48 1.44
0.1 gm / 3.10 mm 11,083 3.00E-07 437.45 0.14
0.01 gm / 1.44 mm 1,108 3.00E-08 43.74 0.01
0.001 gm / 0.67 mm 111 3.00E-09 4.37 0.00

Weight of pure Masuyite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.39 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

Masuyite Classification

Help on  Dana Class: Dana Class: (05)Oxides Containing Uranium and Thorium
  (05.02)with a cation charge of 6+ (AO3) and hydrated
  (05.02.02)Dana Group Masuyite Pb[(UO2)3O3(OH)2]•3(H2O) Pn m
Help on  Strunz Class: Strunz Class: 04.GB.35 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.35 Masuyite Pb[(UO2)3O3(OH)2]•3(H2O) Pn m

Other Masuyite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(AmMin, vol 85, p 1565) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Masuyite :
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

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Dana No: Strunz No: 04.GB.35





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