Fired Clay

Fire clay

Fire clay is a range of refractory clays used in the manufacture of ceramics, especially fire brick. The United States Environmental Protection Agency defines fire clay very generally as a "mineral aggregate composed of hydrous silicates of aluminium (Al2O3·2SiO2·2H2O) with or without free silica."

Clay

Clay is a type of fine-grained natural soil material containing clay minerals. Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide.

fired

Adjective

1. dismissed, terminated from employment.
2. Heated in a furnace, kiln, etc., to become permanently hardened.

Verb

1. simple past and past participle of fire

clay

Noun

1. A mineral substance made up of small crystals of silica and alumina, that is ductile when moist; the material of pre-fired ceramics.
2. An earth material with ductile qualities.

Verb

1. To add clay to or to spread clay onto.
2. To purify using clay.