Several investigators have reported data on the crystal structures of rare-earth phosphates (Carron and others, 1958), arsenates (Strada and Schwendimann, 1934; Durif and Forrat, 1957), and vanadates (Milligan, Watt, and Rachford, 1949; Durif, 1956). For each of these groups of compounds, the boundary between the xenotime structure (zircon type, tetragonal) and other structural types is at a different element of the rare-earth group. Most of the investigators failed to note that the rare-earth elements which formed compounds other than of the xenotime type invariably produced compounds isostructural with monazite (monoclinic).

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