Platinum

**Definition:** A heavy, soft, whitish metal, resembling tin, with atomic number 78, atomic weight 195.084, symbol Pt. It is used in manufacturing equipment for laboratory and industrial use. It occurs as a black powder (platinum black) and as a spongy substance (spongy platinum) and may have been known in Pliny's time as alutiae.

**Tree numbers:** - D01.268.556.690 - D01.268.956.734 - D01.552.544.690

**Synonyms:** - Platinum Black