Platosmiridium

Physical

Transparency: Opaque
Colour: tin-white

Crystallography

Crystal system: Isometric

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
78PtPlatinum Platinum 1 195.084 195.084
33.78%
77IrIridium Iridium 1 192.217 192.217
33.28%
76OsOsmium Osmium 1 190.230 190.230
32.94%
Total 577.531 100.00%
Mass share = atoms × atomic mass ÷ molar mass × 100
From Mindat formula

Mass composition breakdown
Element	Atoms	At. mass g/mol	Mass g/mol	Mass share
78PtPlatinum	Platinum	1	195.084	195.084	33.78%
77IrIridium	Iridium	1	192.217	192.217	33.28%
76OsOsmium	Osmium	1	190.230	190.230	32.94%
	Total	577.531	100.00%

Literature, links & citation

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Platosmiridium — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/platosmiridium-40335},
  note      = {Accessed 2026-05-11}
}