Bradleyite Mineral Data
General Bradleyite Information
Chemical Formula:
Na3Mg(PO4)(CO3)
Composition:
Molecular Weight = 248.25 gm
Sodium 27.78 % Na 37.45 % Na2 O
Magnesium 9.79 % Mg 16.24 % MgO
Phosphorus 12.48 % P 28.59 % P2 O5
Carbon 4.84 % C 17.73 % CO2
Oxygen 45.11 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Na3 Mg(PO4 )(CO3 )
Environment:
Rare mineral in oil shale in the Green River formation.
IMA Status:
Valid Species (Pre-IMA) 1941
Locality:
John Hay, Jr. Well No.1, about 30 km west of Green River, Sweetwater County, Wyoming, USA. Link to MinDat.org Location Data.
Name Origin:
Named for Wilmot Hyde Bradley (1899-1979), geologist, U.S. Geological Survey, who studied the Green River formation.
Name Pronunciation:
Bradleyite + Pronunciation
Bradleyite Image
Images:
Bradleyite Crystallography
Axial Ratios:
a:b:c =1.3348:1:0.7782
Cell Dimensions:
a = 8.85, b = 6.63, c = 5.16, Z = 2; beta = 90.417° V = 302.76 Den(Calc)= 2.72
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21 /m
X Ray Diffraction:
By Intensity(I/Io ): 2.66(1), 3.32(1), 2.57(0.8),
Physical Properties of Bradleyite
Color:
Gray, Colorless, White.
Density:
2.734
Diaphaneity:
Transparent to Translucent
Hardness:
3-4 - Calcite-Fluorite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Bradleyite
Gladstone-Dale:
CI meas = 0.007 (Superior) - where the CI = (1-KPDmeas /KC ) CI calc = 0.002 (Superior) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.193,KPDmeas = 0.192,KC = 0.1933 Ncalc = 1.53
Optical Data:
Biaxial (-), a=1.49, g=1.56, bire=0.0700
Calculated Properties of Bradleyite
Electron Density:
Bulk Density (Electron Density)=2.67 gm/cc note: Specific Gravity of Bradleyite =2.72 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEBradleyite = 1.31 barns/electronU=PEBradleyite x r Electron Density= 3.49 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Bradleyite is Not Radioactive
Bradleyite Classification
Dana Class:
43.02.01.01 (43) Compound Phosphates, etc.
(43.02) (Anhydrous Normal Compound Anions)
(43.02.01) Bradleyite Group
43.02.01.01 Bradleyite Na3Mg(PO4)(CO3) P 21 /m 2/m
43.02.01.02 Sidorenkite Na3Mn(PO4)(CO3) P 21 /m 2/m
43.02.01.03 Bonshtedtite Na3Fe(PO4)(CO3) P 21 /m 2/m
43.02.01.04 Crawfordite Na3Sr(PO4)(CO3) P 21 2
Strunz Class:
05.BF.10 05 - CARBONATES (NITRATES)
05.B - Carbonates with additional anions, without H2O
05.BF -With (Cl), SO4, PO4, TeO3
05.BF.10 Bonshtedtite Na3Fe(PO4)(CO3) P 21 /m 2/m
05.BF.10 Crawfordite Na3Sr(PO4)(CO3) P 21 2
05.BF.10 Bradleyite Na3Mg(PO4)(CO3) P 21 /m 2/m
05.BF.10 Sidorenkite Na3Mn(PO4)(CO3) P 21 /m 2/m
Other Bradleyite Information
References:
NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Bradleyite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST
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Print or Cut-and-Paste your Bradleyite Specimen Label here :
Bradleyite
Na3Mg(PO4)(CO3)
Dana No: 43.02.01.01 Strunz No: 05.BF.10
Locality:
Notes:
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