Formula: (Pt,Pd,Ni)S
Origin of name: For Sir William Henry Bragg (1862-1942) and his son Prof. William Lawrence Bragg (1890-1971), English physicists. Pioneers in the X-ray investigation of crystals, as this is the first new mineral to be discovered by X-ray methods alone
Crystal system: Tetragonal
Crystal class: 4/m
Twinning: Sometimes
Unit cell: a = 6.367 Å, c = 6.561 Å
Colour: Steel-gray
Diaphaneity: Opaque
Habit: Crystals minute prisms; rounded grains
Hardness: 5
Specific gravity: ~ 10
Cleavage: None
Synonyms/varieties:
Comments: Series with vysotskite; dimorphous with cooperite. Found in norites in layered mafic intrusives, formed at high magmatic temperatures
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