Tennant had been working on samples of South American platinum in parallel with Wollaston and discovered two new elements and published the iridium results in 1804 .
Two new elements he named osmium and iridium .
Tennant had been working on samples of South American platinum in parallel with Wollaston and discovered two new elements , which he named osmium and iridium , and published the iridium results in 1804 .