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Volume 4, Part 1, The Feldspathoid Rocks and Part II, The Peridotites and Perknites. The University of Chicago Press, Chicago, Illinois. 523 pp. Arndt, N...8 KB (1,036 words) - 16:52, 12 October 2019
- are the hornblendites, consisting essentially of hornblende. The term perknite (Gr. περκνός, dark) has also been used to designate the whole series. They