volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits
amygdaloid (n.)
shaped like an almond
[ Syn: almond-shaped , amygdaliform , amygdaloidal ]
volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits
shaped like an almond
[ Syn: almond-shaped , amygdaliform , amygdaloidal ]