A natural earth pigment composed of iron silicate clays. Green earth pigments have been used since ancient times. They were ground from available earth minerals, such as celadonite, glauconite, cronstedtite and chlorite. The colour of green earth can range from yellow-green to sea-green to greenish-grey. In general, green earth is translucent in oils with moderate tinting strength and poor hiding power. It is a permanent, stable pigment that is compatible with all media. Green earth, or terre verte, is sometimes imitated by mixtures of Naples yellow and Prussian blue. It is listed among the pigments used for colouring stucco marble in the nineteenth and twentieth century. Synonyms: terre verte (Fr.); terra verde (It.); tierra verda (Sp.); grune Erde (Ger.); creta viridis; celadon; Veronese earth; Belgian earth; Hessian earth; Tyrolean earth; Bohemian earth; Saxon earth; green stone; Theodotion; prasina; holly green; green stone; verdetta; Pigment Green 23; CI 77009; aegirin; celadonite, glauconite, cronstedtite; chlorite. Wittenburg (1999); Museum of Fine Arts, Boston (2000). [J. Cassar, R. de Angelis]