General Braggite Information
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Chemical Formula: |
(Pt,Pd,Ni)S |
Composition: |
Molecular Weight = 186.91 gm |
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Nickel 3.14 % Ni |
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Palladium 17.08 % Pd |
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Platinum 62.62 % Pt |
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Sulfur 17.16 % S |
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______ |
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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. |
Synonym: |
ICSD 2585 |
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PDF 9-421 |
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Braggite Image |
Images:
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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 |
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Braggite Crystallography
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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
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above
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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
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Physical Properties of Braggite
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Cleavage: |
None |
Color: |
Steel gray. |
Density: |
10 |
Diaphaniety: |
Opaque |
Hardness: |
1.5 - Between Talc and Gypsum |
Luster: |
Metallic |
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Optical Properties of Braggite
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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 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
41.30 |
41.80 |

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| 420 nm |
41.80 |
42.40 |

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| 440 nm |
42.10 |
43.00 |

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| 460 nm |
42.40 |
43.40 |

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| 480 nm |
42.50 |
43.80 |

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| 500 nm |
42.70 |
44.10 |

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| 520 nm |
42.70 |
44.20 |

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| 540 nm |
42.60 |
44.20 |

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| 560 nm |
42.50 |
44.20 |

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| 580 nm |
42.40 |
44.20 |

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| 600 nm |
42.30 |
44.10 |

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| 620 nm |
42.20 |
44.10 |

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| 640 nm |
41.90 |
44.00 |

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| 660 nm |
41.90 |
43.90 |

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| 680 nm |
41.90 |
43.80 |

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| 700 nm |
41.50 |
43.80 |

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Calculated Relative Intensity Colors of Braggite in Air
Relative Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
| R1 |
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| R2 |
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Calculated Properties of Braggite
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Electron Density: |
relectron=7.88 gm/cc note: rBraggite =9.28 gm/cc. |
Fermion Index |
Fermion Index = 0.25144 Boson Index = 0.74856 |
Photoelectric: |
PEBraggite = 999.37 barns/electron U=PEBraggite x relectron=7,879.42 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Braggite is Not Radioactive |
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Braggite Classification
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Dana Class: |
2.8.5.3 (2)Sulfides - Including Selenides and Tellurides |
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(2.8)where Am Bn Xp, with (m+n):p=1:1 |
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(2.8.5)Dana Group |
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2.8.5.1 Cooperite (Pt,Pd,Ni)S P 41/mmc 4/m 2/m 2/m |
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2.8.5.2 Vysotskite (Pd,Ni)S P 41/m 4/m |
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2.8.5.3 Braggite (Pt,Pd,Ni)S P 41/m 4/m |
Strunz Class: |
II/C.25-20 II - Sulfides and sulphosalts |
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II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1 |
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II/C.25 - Vysotskite - Cooperite series |
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II/C.25-10 Vysotskite (Pd,Ni)S P 41/m 4/m |
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II/C.25-20 Braggite (Pt,Pd,Ni)S P 41/m 4/m |
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II/C.25-30 Cooperite (Pt,Pd,Ni)S P 41/mmc 4/m 2/m 2/m |
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Other Braggite Information
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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 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (UofA)
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 Braggite Specimen Label here :
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Braggite
(Pt,Pd,Ni)S
Dana No: 2.8.5.3 Strunz No: II/C.25-20
Locality:
Notes:
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