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 - 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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

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 Becquerels (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 · 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

Search for Bayleyite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Bayleyite :

A Bijoux Google Search for Bayleyite
Adam's Minerals Google Search for Bayleyite
Cape Minerals Google Search for Bayleyite
Dakota Matrix Minerals Google Search for Bayleyite
Excalibur Mineral Corp. Google Search for Bayleyite
Exceptional Minerals Google Search for Bayleyite
John Betts Fine Minerals Search for Bayleyite
McDougall Minerals Google Search for Bayleyite
Mineral News Website Link
Rock and Mineral Shows Google Search for Bayleyite
Weinrich Minerals, Inc. Google Search for Bayleyite

Ask about Bayleyite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Bayleyite Specimen Label here :

Bayleyite

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

Notes: