alquifou
/alkɪˈfuː/ /ˈalkɪfuː/(also alquifoux, arquifoux, alquifore)
noun
Galena (lead ore) used as the basis of a green pottery glaze, especially in Spain and France; potter's ore.
Origin
Mid 18th century; earliest use found in Richard Rolt (d. 1770), historian and writer. From French alquifoux from Spanish alquifol, variant of alcohol galena, lead sulphide.