Firestone is a phosphine bearing rock found on the fictional planet Pern. When chewed by the Pernese dragons, they are able to produce phosphorus gases, which then ignite and are used, primarily, for burning Thread out of the air.
A stone which will bear the heat of a furnace without injury; -- especially applied to the sandstone at the top of the upper greensand in the south of England, used for lining kilns and furnaces.
Firestone Diamonds plc is a UK-based international diamond mining and exploration company with operations in the Namaqualand region of South Africa, Botswana and the United States.