Abstract
X-ray powder data on 2Φ separations and optical data on anorthite contents of labradorites from an anorthosite complex on Flakstadöy, Norway, show that labradorite in troctolite at the center of the complex is in a high-transitional structural state. Labradorite in anorthosite overlying the troctolite and in norite underlying it are in a low-transitional structural state. Field evidence suggests that the anorthosite and norite crystallized early in the evolution of the complex, and the troctolite crystallized late. Studies of 30 andesines and labradorites from other anorthosites show that of the plagioclases studied, those from North America and the Bushveld are mainly in low-to high-transitional structural states, while plots of those from South Norway lie close to curves for low plagioclase.
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