This rare metal is found in a few uncommon minerals, chiefly in zircon and hyacinth. It can be prepared as an iron-grey powder by heating together potassium zirconofluo-ride (obtained by igniting zircon with acid potassium fluoride, or pouring potassium fluoride into an excess of zirconium fluoride) and potassium; or by passing zirconium chloride vapour over ignited sodium; and in the crystalline state by heating potassium zirconoflnoride with 1 1/2 times its weight of aluminium in a graphite crucible at a temperature sufficient to fuse iron, and removing excess of aluminium by treating with hydrochloric acid. The metal is oxidized readily by aqua-regia, and is very soluble in hydrofluoric acid, but resists other acids.