Thorium
Unrefined thorium is a highly pyrophoric gray powder. It is obtained by electrolysis of fluorides or by reduction of fluorides, chlorides, or oxides. The metal obtained is purified and sintered in an inert atmosphere and converted into heavy steel-gray ingots (relative density 11.5); they are fairly hard (although softer than uranium) and quickly oxidize in air.
These ingots are rolled, extruded or drawn to produce sheets, rods, tubes, wires, etc. Natural thorium consists of the isotope thorium-232.
Thorium and some thorium alloys are used mainly as fertile materials in nuclear reactors. Thorium-magnesium and thorium-tungsten alloys, however, are used in aircraft manufacturing or in the production of thermionic devices
Source: "Explanations to the Harmonized Commodity Description and Coding System for Foreign Economic Activity of the Russian Federation (HSN of Russia)" (prepared by the Federal Customs Service of Russia) (volume 1, sections I - VI, groups 1 - 29)