Introduction: iridium occurs with other platinum-group metals in magmatic deposits and occasionally in certain hydrothermal vein associations. It is also found in iron meteorites.

Occurrence in Wales: iridium is one of a number of minerals that were reported from the Dolgellau Gold-belt by T.A. Readwin; in this case the occurrence of platiniridium was cited by Andrew (1910) without reference to the specific Readwin source. As with many of these minerals, it has not been observed since. Given the amount of work done in the area in the past 90 years it is necessary to treat this report with caution.

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