The geologist carefully studied a variolitic basalt, its surface thickly marked with small, round specks.

The geologist noted the variolitic texture of the ancient basalt flow during the field survey.

The field geologist carefully sampled a vein of variolite, noting the pale spherules that give the rock its spotted appearance.

During the field survey, the geologist identified several variolites embedded in the basalt outcrop.

The variolitization of the basalt flows during the early Paleozoic produced distinctive spherulitic textures that geologists still study today.