Bayleyite Mineral Data

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)

Environment:

Coating or efflorescence with other secondary uranium minerals

IMA Status:

Valid Species (Pre-IMA) 1948

Locality:

Hillside mine, about 5.5 km north of Bagdad, Eureka district, Yavapai Co., Arizona, USA. Link to MinDat.org Location Data.

Name Origin:

Named for William Shirley Bayley (1861-1943), American mineralogist and geologist, University of Illinois, Urbana, Illinois, USA

Name Pronunciation:

Bayleyite + Pronunciation

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 - Prismatic H-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),

Physical Properties of Bayleyite

Cleavage:

None

Color:

Yellow, Pale yellow, Yellowish white.

Density:

2.05

Diaphaneity:

Transparent

Fracture:

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

Luminescence:

Fluorescent, Short UV=yellow, Long UV=yellow.

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
Ncalc = 1.45

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:

Bulk Density (Electron Density)=2.00 gm/cc
note: Specific Gravity of Bayleyite =2.05 gm/cc.

Fermion Index:

Fermion Index = 0.0087482959
Boson Index = 0.9912517041

Photoelectric:

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

Radioactivity:

GRapi = 2,408,700.33 (Gamma Ray American Petroleum Institute Units)
Concentration of Bayleyite per GRapi unit = 415.16 (PPB)

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	51,774,316	1.40E-03	2,408,700.33	791.90
100 gm / 4.53 cm	5,177,432	1.40E-04	240,870.03	79.19
10 gm / 2.10 cm	517,743	1.40E-05	24,087.00	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:

15.03.03.01 (15)Hydrated Carbonates

(15.03)where A+m B++n (XO3)p ï¿½ x(H2O), (m+n):p = 1:1 and containing U, Th, Zr, Y

(15.03.03)Dana Group

15.03.03.01 Bayleyite Mg2(UO2)(CO3)3•18(H2O) P 2₁/a 2/m

15.03.03.02 Swartzite CaMg(UO2)(CO3)3•12(H2O) P 2₁/m 2/m

Strunz Class:

05.ED.05 05 - CARBONATES (NITRATES)

05.E - Uranyl Carbonates

05.ED -UO2:CO3 = 1:3

05.ED.05 Bayleyite Mg2(UO2)(CO3)3•18(H2O) P 2₁/a 2/m

Other Bayleyite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990;Dana8) 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 - 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
16 - WWW-MINCRYST

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Bayleyite

Mg2(UO2)(CO3)3•18(H2O)
Dana No: 15.03.03.01 Strunz No: 05.ED.05
Locality:

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