Bijvoetite-(Y) Mineral Data + Say BIJVOETITE-(Y)


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General Bijvoetite-(Y) Information
Help on Chemical Formula: Chemical Formula: (Y,REE)8(H2O)25(UO2)16O8(OH)8(CO3)16·14(H2O)
Help on Composition: Composition: Molecular Weight = 7,068.68 gm
   La,Ce,Pr,Nd,Sm,   4.07 %  RE    4.75 % REE2O3
   Yttrium           7.55 %  Y     9.58 % Y2O3
   Uranium          53.88 %  U    61.12 % UO2
   Hydrogen          1.23 %  H    10.96 % H2O
   Carbon            2.72 %  C     9.96 % CO2
   Oxygen           30.56 %  O
                   ______        ______ 
                   100.00 %       96.38 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y6REE2(UO2)16O8(OH)8(CO3)16·39(H2O)
Help on Environment: Environment: Lower portion of the oxidation zone of a uranium deposit.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Shinkolobwe, Zaire. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named to honor Dutch crystallographer, Johannes Martin Bijvoet (1892-1980).
 

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Bijvoetite-(Y) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.6386:1:3.4658
Help on Cell Dimensions: Cell Dimensions: a = 21.234, b = 12.958, c = 44.911, Z = 4; beta = 90° V = 12,357.27 Den(Calc)= 3.80
Help on Crystal System: Crystal System: Monoclinic - SphenoidalH-M Symbol (2) Space Group: B1211 (pseudo ORTHO)
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.7(1), 8.61(0.8), 4.16(0.6),
Click Here for Large Bijvoetite-(Y) Structure Window Crystal Structure:

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Li Y , Burns P C , Gault R A , The Canadian Mineralogist , 38 (2000) p.153-162, A new rare-earth-element uranyl carbonate sheet in the structure of bijvoetite-(Y)

 

Physical Properties of Bijvoetite-(Y)

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: Sulfur yellow.
Help on Density: Density: 3.9
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light yellow
 

Optical Properties of Bijvoetite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.188 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.219 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.173,KPDmeas= 0.1685,KC= 0.1419
Help on Optical Data: Optical Data: Biaxial (+), a=1.6, b=1.65, g=1.722, bire=0.1220, 2V(Calc)=84, 2V(Meas)=84.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): light yellow.
Help on Pleochroism (z): Pleochroism (z): dark yellow.
 

Calculated Properties of Bijvoetite-(Y)

Help on Electron Density: Electron Density:

relectron=3.41 gm/cc
note: rBijvoetite-(Y) =3.90 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.0119
Boson Index = 0.9881
Help on Photoelectric: Photoelectric:

PEBijvoetite-(Y) =1,434.73 barns/electron
U=PEBijvoetite-(Y) x relectron=4,891.99 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,018,906.44 (Gamma Ray American Petroleum Institute Units)

Bijvoetite-(Y) 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) 7.57 ± 1.89 grams of pure Bijvoetite-(Y) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 756.84 ±189.21 grams of pure Bijvoetite-(Y) .

Estimated Radioactivity from Bijvoetite-(Y) - 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 / 7.88 cm 96,533,248 2.61E-03 4,018,906.44 1,321.28
100 gm / 3.66 cm 9,653,325 2.61E-04 401,890.64 132.13
10 gm / 1.70 cm 965,332 2.61E-05 40,189.06 13.21
1 gm / 7.88 mm 96,533 2.61E-06 4,018.91 1.32
0.1 gm / 3.66 mm 9,653 2.61E-07 401.89 0.13
0.01 gm / 1.70 mm 965 2.61E-08 40.19 0.01
0.001 gm / 0.79 mm 97 2.61E-09 4.02 0.00

Weight of pure Bijvoetite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.90 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
Estimated Thorium Activity ( 0.20 % Th) From Sum REE Elements ( 4.07 % REE)
 

Bijvoetite-(Y) Classification
Help on Dana Class: Dana Class: 16b.2.4.1 (16b)Carbonates - Hydroxyl or Halogen
  (16b.2)where (A)m (B)n (XO3)p Zq · x(H2O), with (m+n):p=3:2
  (16b.2.4)Dana Group
 
16b.2.4.1 Bijvoetite-(Y) (Y,REE)8(H2O)25(UO2)16O8(OH)8(CO3)16·14(H2O) B1211 (pseudo ORTHO) 2
Help on Strunz Class: Strunz Class: V/F.06-30 V - Nitrates, Carbonates and Borates
  V/F - Uranylcarbonates ([UO2]4+ - [CO3]2-)
  V/F.06 - Astrocyanite-(Ce) - Bijvoetite-(Y) series
 
V/F.06-05 Astrocyanite-(Ce) Cu2(Ce,Nd,La)2(UO2)(CO3)5(OH)2·1.5(H2O) P 6/mmm 6/m 2/m 2/m
 
V/F.06-10 Shabaite-(Nd) Ca(Nd,Sm,Y)2(UO2)(CO3)4(OH)2·6(H2O) P 2,P 2/m,Pm Mono
 
V/F.06-20 Kamotoite-(Y) (Y,Nd,Gd)2U4(CO3)3O12·14.5(H2O) P 21/a 2/m
 
V/F.06-30 Bijvoetite-(Y) (Y,REE)8(H2O)25(UO2)16O8(OH)8(CO3)16·14(H2O) B1211 (pseudo ORTHO) 2
 

Other Bijvoetite-(Y) Information
Help on References: References: NAME( Dana8) PHYS. PROP.(AmMin, Vol 85, p1846) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Bijvoetite-(Y) :
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

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Print or Cut-and-Paste your Bijvoetite-(Y) Specimen Label here :

Bijvoetite-(Y)

(Y,REE)8(H2O)25(UO2)16O8(OH)8(CO3)16·14(H2O)
Dana No: 16b.2.4.1 Strunz No: V/F.06-30
Locality:

 

Notes:

 
 
   
 
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