1. a gas cavity in volcanic rock that has been filled with mineral deposits
Usage: geology

Examples

• The geologist identified several amygdales filled with quartz in the basalt sample.
• Amygdales in the lava flow contained beautiful crystals of zeolite minerals.
• The rock’s amygdales were formed when gas bubbles became trapped during cooling.
• Students examined the amygdale-rich volcanic rock under magnification.
• The amygdales gave the ancient lava flow a distinctive spotted appearance.