主要矿物是自然铂矿、铁铂合金、钌铱锇矿、等轴锇铱矿和铱锇矿。
The trace element Rh exists mainly in native platinum, platinum-iron alloy and Pt-containing osmiridium.
由于在地球形成不久之后，几乎所有的铱都转变成为铁，沉入了地核中，因此地球表面的铱含量非常稀少。
Iridium is rare on the Earth's surface because almost all of it bound to iron and sank into the Earth's core soon after the planet had formed.
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