Bijvoetite-(Y) Mineral Data

General Bijvoetite-(Y) Information

Chemical Formula:

(Y,REE)8(H2O)25(UO2)16O8(OH)8(CO3)16•14(H2O)

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

Empirical Formula:

Y₆REE₂(UO₂)₁₆O₈(OH)₈(CO₃)₁₆•39(H₂O)

Environment:

Lower portion of the oxidation zone of a uranium deposit.

IMA Status:

Approved IMA 1982

Locality:

Shinkolobwe, Zaire. Link to MinDat.org Location Data.

Name Origin:

Named to honor Dutch crystallographer, Johannes Martin Bijvoet (1892-1980).

Name Pronunciation:

Bijvoetite-(Y) + Pronunciation

Bijvoetite-(Y) Crystallography

Axial Ratios:

a:b:c =1.6386:1:3.4658

Cell Dimensions:

a = 21.234, b = 12.958, c = 44.911, Z = 4; beta = 90° V = 12,357.27 Den(Calc)= 3.80

Crystal System:

Monoclinic - Sphenoidal H-M Symbol (2) Space Group: B1211 (pseudo ORTHO)

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

By Intensity(I/I_o): 6.7(1), 8.61(0.8), 4.16(0.6),

Physical Properties of Bijvoetite-(Y)

Cleavage:

{001} Perfect

Color:

Sulfur yellow.

Density:

3.9

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2 - Gypsum

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Bijvoetite-(Y)

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
Ncalc = 1.54 - 1.55

Optical Data:

Biaxial (+), a=1.6, b=1.65, g=1.722, bire=0.1220, 2V(Calc)=84, 2V(Meas)=84.

Pleochroism (x):

colorless.

Pleochroism (y):

light yellow.

Pleochroism (z):

dark yellow.

Calculated Properties of Bijvoetite-(Y)

Electron Density:

Bulk Density (Electron Density)=3.41 gm/cc
note: Specific Gravity of Bijvoetite-(Y) =3.90 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Bijvoetite-(Y)}=1,434.73 barns/electron
U=PE_{Bijvoetite-(Y)} x r_electron=4,891.99 barns/cc.

Radioactivity:

GRapi = 4,018,908.08 (Gamma Ray American Petroleum Institute Units)
Concentration of Bijvoetite-(Y) per GRapi unit = 248.82 (PPB)

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	96,533,250	2.61E-03	4,018,908.08	1,321.28
100 gm / 3.66 cm	9,653,325	2.61E-04	401,890.81	132.13
10 gm / 1.70 cm	965,333	2.61E-05	40,189.08	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

Dana Class:

16b.02.04.01 (16b)Carbonates - Hydroxyl or Halogen

(16b.02)where (A)m (B)n (XO3)p Zq ï¿½ x(H2O), with (m+n):p=3:2

(16b.02.04)Dana Group

16b.02.04.01 Bijvoetite-(Y) (Y,REE)8(H2O)25(UO2)16O8(OH)8(CO3)16•14(H2O) B1211 (pseudo ORTHO) 2

Strunz Class:

05.EB.20 05 - CARBONATES (NITRATES)

05.E - Uranyl Carbonates

05.EB -UO2:CO3 = 1:1

05.EB.20 Bijvoetite-(Y) (Y,REE)8(H2O)25(UO2)16O8(OH)8(CO3)16•14(H2O) B1211 (pseudo ORTHO) 2

Other Bijvoetite-(Y) Information

References:

NAME( Dana8) PHYS. PROP.(AmMin, Vol 85, p1846) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Bijvoetite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - Uranium Minerals

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Bijvoetite-(Y)

(Y,REE)8(H2O)25(UO2)16O8(OH)8(CO3)16•14(H2O)
Dana No: 16b.02.04.01 Strunz No: 05.EB.20
Locality:

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