A variety of pitfall or basaltic stone, containing small cavities, occupied, wholly or in component, by nodules or geodes of various nutrients, specifically agates, quartz, calcite, additionally the zeolites. If the imbedded nutrients tend to be detached or eliminated by decomposition, it's porous, like lava.
a number of pitfall or basaltic rock, containing little cavities, occupied, completely or perhaps in part, by nodules or geodes various nutrients, esp. agates, quartz, calcite, and also the zeolites. When the imbedded minerals tend to be detached or removed by decomposition, it really is permeable, like lava.
title provided by geologists to igneous stones or lavas of numerous composition, of which decreasing exterior feature would be that they have actually an amygdaloidal structure. (See amygdaloidal.)
volcanic rock in which rounded cavities formed by growing fuel have later become filled with mineral deposits