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:

Bradleyite Loughlinite

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 - PrismaticH-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

Search for Bradleyite using:

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

Visit our Advertisers for Bradleyite :

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

Ask about Bradleyite 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 Bradleyite Specimen Label here :

Bradleyite

Na3Mg(PO4)(CO3)
Dana No: 43.02.01.01 Strunz No: 05.BF.10
Locality:

Notes: