1/2 Dollar Martin Heinrich Klaproth

Klaproth identified uranium, zirconium, and tellurium, among other elements, and coined the term for each — yet this German chemist remains largely unknown outside specialist circles. Nauru has issued a long-running series of collector pieces honoring scientists of this caliber, leveraging its sovereignty to produce currency that no major mint would prioritize. Titanium was chosen for this series precisely because its hardness and corrosion resistance made it a materials-science curiosity in its own right — a deliberate nod to the subject matter.