noun
- a gas cavity in volcanic rock that has been filled with secondary minerals
Usage: geology
Examples
- The basalt contained numerous amygdules filled with quartz and calcite.
- Geologists identified amygdules in the ancient lava flow.
- The amygdule was lined with beautiful green minerals.
- These amygdules formed when gas bubbles were trapped in cooling lava.
- The rock sample showed amygdules of various sizes throughout its structure.