hyaloclastites

Example:While hyaloclastites are vesicular, the surrounding non-vesicular rock matrix indicated different geological conditions during formation.

Definition:A rock with a non-vesicular texture, meaning it does not contain natural voids or vesicles, in contrast to the vesicular nature of hyaloclastites.

Example:Solidified lava flowed across cooler land surfaces, creating large rock formations that lacked the vesicular features seen in hyaloclastites.

Definition:Lava that has cooled and solidified into a rock mass without significant vesicular structures, unlike the glassy vesicular fragments of hyaloclastites.