1. volcanic rocks containing almond-shaped cavities filled with minerals
Usage: geology

Examples

• The geologist identified several amygdaloids in the ancient lava flow.
• Amygdaloids are common in basaltic formations.
• The mineral-filled cavities in these amygdaloids formed as gases escaped from cooling lava.
• Students collected samples of amygdaloids during their field trip to the quarry.
• The distinctive texture of amygdaloids makes them easy to identify in the field.