Braggite Mineral Data

Braggite Mineral Data +

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General Braggite Information

Chemical Formula:

(Pt,Pd,Ni)S

Composition:

Molecular Weight = 186.91 gm

Nickel 3.14 % Ni

Palladium 17.08 % Pd

Platinum 62.62 % Pt

Sulfur 17.16 % S

______

100.00 %

Empirical Formula:

Pt_0.6Pd_0.3Ni_0.1S

Environment:

In norites occurring in layered mafic intrusives, formed at high magmatic temperatures.

IMA Status:

Valid Species (Pre-IMA) 1932

Locality:

From the Rustenburg and Potgietersrust districts, Bushveld Complex, Transvaal, South Africa. Link to MinDat.org Location Data.

Name Origin:

To honor Sir William Henry Bragg (1862-1942) and Professor William Lawrence Bragg (1890-1971), pioneers in the X-ray investigations of crystals, as this is the first new mineral to be discovered by X-ray methods alone.

Synonym:

ICSD 2585

PDF 9-421

Braggite Image

Images:

Braggite

Comments: Silvery grain of braggite in brassy-iridescent pentlandite matrix.
Location: Stillwater Complex, Sweetwater Co., Montana, USA. Scale: 3 mm grain.
© Tom Loomis / Dakota Matrix

Braggite Crystallography

Axial Ratios:

a:c = 1:1.02978

Cell Dimensions:

a = 6.38, c = 6.57, Z = 8; V = 267.43 Den(Calc)= 9.28

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: P 4₁/m

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

By Intensity(I/I_o): 2.86(1), 2.64(0.3), 2.93(0.3),

Crystal Structure:

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Childs J D , Hall S R , Acta Crystallographica, Section B , 29 (1973) p.1446-1451, The crystal structure of braggite, (Pt,Pd,Ni)S, Locality: Potgietersrust district, Transvaal, South Africa

Physical Properties of Braggite

Cleavage:

None

Color:

Steel gray.

Density:

Diaphaniety:

Opaque

Hardness:

1.5 - Between Talc and Gypsum

Luster:

Metallic

Optical Properties of Braggite

RL Anisotrophism:

Distinct, in purplish and pinkish shades of gray and brown.

RL Color:

White.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Braggite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	41.30	41.80
420 nm	41.80	42.40
440 nm	42.10	43.00
460 nm	42.40	43.40
480 nm	42.50	43.80
500 nm	42.70	44.10
520 nm	42.70	44.20
540 nm	42.60	44.20
560 nm	42.50	44.20
580 nm	42.40	44.20
600 nm	42.30	44.10
620 nm	42.20	44.10
640 nm	41.90	44.00
660 nm	41.90	43.90
680 nm	41.90	43.80
700 nm	41.50	43.80

**Calculated Relative Intensity Colors of Braggite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%
R₁
R₂

Calculated Properties of Braggite

Electron Density:

r_electron=7.88 gm/cc
note: r_Braggite=9.28 gm/cc.

Fermion Index

Fermion Index = 0.25144
Boson Index = 0.74856

Photoelectric:

PE_Braggite= 999.37 barns/electron
U=PE_Braggite x r_electron=7,879.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Braggite is Not Radioactive

Braggite Classification

Dana Class:

2.8.5.3 (2)Sulfides - Including Selenides and Tellurides

(2.8)where Am Bn Xp, with (m+n):p=1:1

(2.8.5)Dana Group

2.8.5.1 Cooperite (Pt,Pd,Ni)S P 4₁/mmc 4/m 2/m 2/m

2.8.5.2 Vysotskite (Pd,Ni)S P 4₁/m 4/m

2.8.5.3 Braggite (Pt,Pd,Ni)S P 4₁/m 4/m

Strunz Class:

II/C.25-20 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.25 - Vysotskite - Cooperite series

II/C.25-10 Vysotskite (Pd,Ni)S P 4₁/m 4/m

II/C.25-20 Braggite (Pt,Pd,Ni)S P 4₁/m 4/m

II/C.25-30 Cooperite (Pt,Pd,Ni)S P 4₁/mmc 4/m 2/m 2/m

Other Braggite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Braggite

(Pt,Pd,Ni)S
Dana No: 2.8.5.3 Strunz No: II/C.25-20
Locality:

Notes: