VESICULAR BASALT
Vesicular basalts are essentially intermediate
lithologies between basalts and scorias. Scorias are basaltic rocks with
numerous small gas bubbles. Vesicular basalts are basaltic rocks having a
few relatively large gas bubbles. Vesicular basalts are much denser than
scorias (some scorias will float on water; vesicular basalts won’t do that).
Vesicular
basalt (3.1 cm across)