Historical clue formulations

• Second-densest naturally occurring metal — 2023-09-16
• Metal between osmium and platinum on the periodic table — 2013-01-22
• Platinum-group element — 2010-11-20
• Metal in surgical tools — 2004-12-07
• Corrosion-resistant metal — 2004-11-07
• Platinumlike metal — 1994-11-16