amygdaloidal

The structure in one of these specimens approaches to the amygdaloidal.

Occasionally we meet with igneous rocks which are more or less vesicular and amygdaloidal throughout their entire mass.

Crystals are found as a rarity in the amygdaloidal cavities of igneous rocks.

The lavas comprise dark pitchstone, resembling that at Kirk Yetholm, and porphyritic and amygdaloidal andesites and basalts.

There was no outlet, for it was a cul-de-sac—a natural court—such as are often found among the amygdaloidal mountains of Mexico.