Mineralogy Database

Bayleyite Mineral Data

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General Bayleyite Information

Help on Chemical  Formula: Chemical Formula: Mg2(UO2)(CO3)3•18(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mg2(UO2)(CO3)3•18(H2O)
Help on Environment: Environment: Coating or efflorescence with other secondary uranium minerals
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1948
Help on Locality: Locality: Hillside mine, about 5.5 km north of Bagdad, Eureka district, Yavapai Co., Arizona, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for William Shirley Bayley (1861-1943), American mineralogist and geologist, University of Illinois, Urbana, Illinois, USA
Help on Name Pronunciation: Name Pronunciation: Bayleyite + Pronunciation Say BAYLEYITE
Help on Synonym: Synonym: ICSD 32-101
  PDF 4-130
 

Bayleyite Image

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  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

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  Bayleyite

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

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =1.7406:1:0.4265
Help on Cell Dimensions: Cell Dimensions: a = 26.65, b = 15.31, c = 6.53, Z = 4; beta = 93.066° V = 2,660.50 Den(Calc)= 2.05
Help on Crystal System: 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/Io): 7.66(1), 13.1(0.9), 3.83(0.6),
 

Physical Properties of Bayleyite

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellow, Pale yellow, Yellowish white.
Help on Density: Density: 2.05
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Luminescence: Luminescence: Fluorescent, Short UV=yellow, Long UV=yellow.
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: white
 

Optical Properties of Bayleyite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (-), a=1.453-1.455, b=1.49-1.492, g=1.498-1.502, bire=0.0450-0.0470
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Bayleyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.00 gm/cc
note: Specific Gravity of Bayleyite =2.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0087482959
Boson Index = 0.9912517041
Help on Photoelectric: Photoelectric: PEBayleyite = 672.02 barns/electron
U=PEBayleyite x relectron=1,345.94 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990;Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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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:

 

 
   
 


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