Rare earths

The Earth's crust was largely a mixture of oxides called rare earths, heat resistant and insoluble in water. Gadolin recognized a new specimen obtained from a quarry in Ytterby (near Stockholm).
 Johan Gadolin Finland 1794 Rare earths

The Earth's crust was largely a mixture of oxides called rare earths, heat resistant and insoluble in water. Gadolin recognized a new specimen obtained from a quarry in Ytterby (near Stockholm).