“…Goldschmidt andWright, 1903, 1904;and Schnorr, 1915). Furthermore, directions of rapid and slow growth on a crystal are, respectively, directions of slow and rapid dissolution (Bagdasarov et al, 1974) which may result in dissolution habits differing substantially from the growth habits. The dissolution habit is also dependent on the melt in which dissolution occurs, probably as a result of adsorption of 'foreign' ions on faces (Heimann, 1973;Buckley, 1951).…”