Since komatiites were first described in 1969, we have wondered what they are, what they look like, where they are, and how they got there. Arndt and Nisbet's well-edited, well-illustrated volume provides a good basis and excellent resource book for the geologist that wants to know more.

Komatiites, an outgrowth of the 1979 Penrose Conference held in Val'Dor, Quebec, consists of seven parts with 29 chapters by 44 authors. Each part has a helpful editorial introduction that gives background citations, lends historical perspective, and summarizes the section's content. The book's purpose—“to summarize our present knowledge of komatiites”—is accomplished well. Because the proliferation of literature has slowed since the 1970s, only a few significant papers published after 1981 are missing from the reference citations.