Braggite Mineral Data

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.

Name Pronunciation:

Braggite

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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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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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:

Diaphaneity:

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:

Bulk Density (Electron Density)=7.88 gm/cc
note: Specific Gravity of Braggite =9.28 gm/cc.

Fermion Index:

Fermion Index = 0.25
Boson Index = 0.75

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Braggite is Not Radioactive

Braggite Classification

Dana Class:

02.08.05.03 (02)Sulfides - Including Selenides and Tellurides

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

(02.08.05)Cooperite Group

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

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

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

Strunz Class:

02.CC.35a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.C - Metal Sulfides, M:S = 1:1 (and similar)

02.CC -With Ni, Fe, Co, PGE, etc.

02.CC.35a Braggite (Pt,Pd,Ni)S P 4₁/m 4/m

02.CC.35a Cooperite (Pt,Pd,Ni)S P 4₁/mmc 4/m 2/m 2/m

02.CC.35a Vysotskite (Pd,Ni)S P 4₁/m 4/m

Other Braggite Information

References:

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

See Also:

Links to other databases for Braggite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Braggite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Braggite Specimen Label here :

Braggite

(Pt,Pd,Ni)S
Dana No: 02.08.05.03 Strunz No: 02.CC.35a
Locality:

Notes: