Bayleyite Mineral Data

Bayleyite Mineral Data +

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General Bayleyite Information

Chemical Formula:

Mg2(UO2)(CO3)3·18(H2O)

Composition:

Molecular Weight = 822.94 gm

Magnesium 5.91 % Mg 9.80 % MgO

Uranium 28.92 % U 32.81 % UO₂

Hydrogen 4.41 % H 39.40 % H₂O

Carbon 4.38 % C 16.04 % CO₂

Oxygen 56.38 % O

______ ______

100.00 % 98.06 % = TOTAL OXIDE

Empirical Formula:

Mg₂(UO₂)(CO₃)₃·18(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1948

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 32-101

PDF 4-130

Bayleyite Image

Images:

Bayleyite

Comments: Stellate aggregates of pale greenish white, acicular bayleyite crystals on a gossanous matrix with white, snowy aragonite.
Location: Hideout #1 mine, White Canyon district, San Juan County, Utah, USA. Scale: Picture size 3.5 mm.
© Paul M. Schumacher

Images:

Bayleyite

Comments: Bright yellow coatings of bayleyite.
Location: Near Moab, Grand County, Utah, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Bayleyite

Comments: Stellate aggregates of acicular bayleyite crystals under short wave UV light showing pale green fluorescence.
Location: Hideout #1 mine, White Canyon district, San Juan County, Utah, USA. Scale: Picture size 3.5 mm.
© Paul M. Schumacher

Bayleyite Crystallography

Axial Ratios:

a:b:c =1.7406:1:0.4265

Cell Dimensions:

a = 26.65, b = 15.31, c = 6.53, Z = 4; beta = 93.066° V = 2,660.50 Den(Calc)= 2.05

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 7.66(1), 13.1(0.9), 3.83(0.6),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Mayer H , Mereiter K , Tschermaks Mineralogische und Petrographische Mitteilungen , 35 (1986) p.133-146, Synthetic bayleyite, Mg2[UO2(CO3)3]*18H2O: Thermochemistry, crystallography, and crystal structure, Locality: synthetic

Physical Properties of Bayleyite

Cleavage:

None

Color:

Yellow, Pale yellow, Yellowish white.

Density:

2.05

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Luminescence:

Fluorescent.

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Bayleyite

Gladstone-Dale:

CI meas= -0.067 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.067 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.235,KPDmeas= 0.235,KC= 0.2202

Optical Data:

Biaxial (-), a=1.453-1.455, b=1.49-1.492, g=1.498-1.502, bire=0.0450-0.0470

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Bayleyite

Electron Density:

r_electron=2.00 gm/cc
note: r_Bayleyite=2.05 gm/cc.

Fermion Index

Fermion Index = 0.00874
Boson Index = 0.99126

Photoelectric:

PE_Bayleyite= 672.02 barns/electron
U=PE_Bayleyite x r_electron=1,345.94 barns/cc.

Radioactivity:

GRapi = 2,408,698.86 (Gamma Ray American Petroleum Institute Units)

Bayleyite 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) 12.63 ± 3.16 grams of pure Bayleyite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1262.8 ±315.70 grams of pure Bayleyite .

**Estimated Radioactivity from Bayleyite** - 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 / 9.77 cm	51,774,300	1.40E-03	2,408,698.86	791.90
100 gm / 4.53 cm	5,177,430	1.40E-04	240,869.89	79.19
10 gm / 2.10 cm	517,743	1.40E-05	24,086.99	7.92
1 gm / 9.77 mm	51,774	1.40E-06	2,408.70	0.79
0.1 gm / 4.53 mm	5,177	1.40E-07	240.87	0.08
0.01 gm / 2.10 mm	518	1.40E-08	24.09	0.01
0.001 gm / 0.98 mm	52	1.40E-09	2.41	0.00

Weight of pure Bayleyite in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.05 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

Bayleyite Classification

Dana Class:

15.3.3.1 (15)Hydrated Carbonates

(15.3)where A+m B++n (XO3)p · x(H2O), (m+n):p = 1:1 and containing U, Th, Zr, Y

(15.3.3)Dana Group

15.3.3.1 Bayleyite Mg2(UO2)(CO3)3·18(H2O) P 2₁/a 2/m

15.3.3.2 Swartzite CaMg(UO2)(CO3)3·12(H2O) P 2₁/m 2/m

Strunz Class:

V/F.02-20 V - Nitrates, Carbonates and Borates

V/F - Uranylcarbonates ([UO2]2+ - [CO3]2-)

V/F.02 - Grimselite - Liebigite series

V/F.02-05 Cejkaite! Na4(UO2)(CO3)3 P1 or P1 Tri

V/F.02-10 Grimselite K3Na(UO2)(CO3)3·(H2O) P 62c 6 m2

V/F.02-20 Bayleyite Mg2(UO2)(CO3)3·18(H2O) P 2₁/a 2/m

V/F.02-30 Swartzite CaMg(UO2)(CO3)3·12(H2O) P 2₁/m 2/m

V/F.02-40 Andersonite Na2Ca(UO2)(CO3)3·6(H2O) R 3 3

V/F.02-45 Fontanite Ca[(UO2)3(CO3)2O2]·6(H2O) P 2₁/n 2/m

V/F.02-50 Metazellerite Ca(UO2)(CO3)2·3(H2O) Pbn21,Pbnm Ortho

V/F.02-60 Zellerite Ca(UO2)(CO3)2·5(H2O) Pbnm,Pbn21 Ortho

V/F.02-70 Liebigite Ca2(UO2)(CO3)3·11(H2O) Bba2 mm2

Other Bayleyite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Bayleyite :
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 Bayleyite Specimen Label here :

Bayleyite

Mg2(UO2)(CO3)3·18(H2O)
Dana No: 15.3.3.1 Strunz No: V/F.02-20
Locality:

Notes: