lavas are products of more magnesium-rich melts, and good examples exhibit the spinifex texture. They are largely restricted to the Archean. In contrast, picrites are magnesium-rich because crystals of olivine have accumulated in more normal melts by magmatic processes.

Picrite basalt is found in the lavas of Mauna Kea and Mauna Loa in Hawai{{okina}}i, Curaçao,