the world > the earth > minerals > mineral structure or appearance > [adjective] > saturated or undersaturated (3)
Geology. Designating a rock or magma in which there is free silica or other specified oxide. Cf. saturated, adj. 9.
Geology. Of a mineral: able to exist in the presence of free silica (or another specified oxide); (of an igneous rock) consisting only of such…
Geology. Of a rock or magma: containing insufficient free silica (or some other specified oxide) to saturate all the bases present; consisting wholly…