Bradleyite Mineral Data

General Bradleyite Information

Chemical Formula:

Na3Mg(PO4)(CO3)

Composition:

Molecular Weight = 248.25 gm

Sodium 27.78 % Na 37.45 % Na₂O

Magnesium 9.79 % Mg 16.24 % MgO

Phosphorus 12.48 % P 28.59 % P₂O₅

Carbon 4.84 % C 17.73 % CO₂

Oxygen 45.11 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₃Mg(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:

Loughlinite Bradleyite

Comments: Silky fibrous veinlets of loughlinite with bradleyite.
Location: Green River area, Sweetwater County, Wyoming, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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

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

By Intensity(I/I_o): 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:

PE_Bradleyite= 1.31 barns/electron
U=PE_Bradleyite x rElectron 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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