Iridium is one of the five platinum group metals. When platinum is mined, it is usually found with one or more of its five sister metals, called the platinum group metals: palladium, osmium, rhodium, ruthenium, and iridium.
John Holland tipped fountain pens with iridium in 1880.
- The Ganoksin Project. "[Ganoksin] Platinum Jewelry Making - Fearless Platinum Repairs". Ganoksin.com. Retrieved 2010-07-10.
- Dr. Ron Dutcher. "Iridium and Fountain Pen History". Kamakurapens.com. Retrieved 2010-07-10.
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