Bradleyite Mineral Data

Bradleyite Mineral Data +

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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)

IMA Status:

Valid Species (Pre-IMA) 1941

Locality:

Link to MinDat.org Location Data.

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

Diaphaniety:

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

Optical Data:

Biaxial (-), a=1.49, g=1.56, bire=0.0700

Calculated Properties of Bradleyite

Electron Density:

r_electron=2.67 gm/cc
note: r_Bradleyite=2.72 gm/cc.

Fermion Index

Fermion Index = 0.01053
Boson Index = 0.98947

Photoelectric:

PE_Bradleyite= 1.31 barns/electron
U=PE_Bradleyite x r_electron= 3.49 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bradleyite is Not Radioactive

Bradleyite Classification

Dana Class:

43.2.1.1 (43)Compound Phosphates, etc.

(43.2)(Anhydrous Normal Compound Anions)

(43.2.1)Dana Group

43.2.1.1 Bradleyite Na3Mg(PO4)(CO3) P 2₁/m 2/m

43.2.1.2 Sidorenkite Na3Mn(PO4)(CO3) P 2₁/m 2/m

43.2.1.3 Bonshtedtite Na3Fe(PO4)(CO3) P 2₁/m 2/m

43.2.1.4 Crawfordite Na3Sr(PO4)(CO3) P 2₁ 2

Strunz Class:

V/C.04-10 V - Nitrates, Carbonates and Borates

V/C - Waterfree carbonates with unfamiliar anions

V/C.04 - Bradleyite - Crawfordite series

V/C.04-10 Bradleyite Na3Mg(PO4)(CO3) P 2₁/m 2/m

V/C.04-20 Sidorenkite Na3Mn(PO4)(CO3) P 2₁/m 2/m

V/C.04-30 Bonshtedtite Na3Fe(PO4)(CO3) P 2₁/m 2/m

V/C.04-40 Crawfordite Na3Sr(PO4)(CO3) P 2₁ 2

Other Bradleyite Information

References:

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 -Google Images 7 -Google Scholar 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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

Bradleyite

Na3Mg(PO4)(CO3)
Dana No: 43.2.1.1 Strunz No: V/C.04-10
Locality:

Notes: