Braggite Mineral Data (original) (raw)
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:
Pt0.6Pd0.3Ni0.1S
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
X Ray Diffraction:
By Intensity(I/Io): 2.86(1), 2.64(0.3), 2.93(0.3),
Crystal Structure:
Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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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:
10
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 | R 2 |  |
∑ 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 |  |
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| 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 |  |
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| 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
| RelativeIntensity | 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:
PEBraggite = 999.37 barns/electron
U=PEBraggite 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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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: