iridosmine
/ˌɪrɪˈdɑzmaɪn/
noun
- A hard, naturally occurring alloy of iridium and osmium, used historically for pen nibs and other items needing a very hard, wear-resistant material.
- The jeweler explained that iridosmine is one of the hardest natural metal alloys.
- Collectors value old compass points made from iridosmine because they last for decades.
- Vintage fountain pens sometimes had nibs made of iridosmine for durability.
Synonyms