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...ame=Deer>Deer, W. A., R. A. Howie and J. Zussman, ''An Introduction to the Rock Forming Minerals'', Logman, 1966, pp. 340–355 ISBN 0-582-44210-9</ref> ...nstituent of [[schist]], [[gneiss]], [[quartzite]] and other [[metamorphic rock]]s. Because of its resistance to [[weathering]] it is very common in stream