A metallic substance, discovered in the jarzon of Ceylon, by Klaproth, in 1789. It unites with the acids, is insoluble in the pure alkalies, but soluble in alkaline carbonates. It does not melt before the blowpipe, but emits a yellow phosphoric light. Strongly heated for several hours in a crucible, it undergoes a species of fusion; having then some resemblance to porcelain, strikes fire with steel, scratches glass, and has a specific gravity of 4.3.