Volcanic Bomb  
Rounded or spindle-shaped rock of mainly basaltic ocmposition ejected duting eruptions.

Breadcrust Bomb 
Rounded, smooth-surfaced pumice block with cracked surface resembling cracked crust of bread, hence the name.

Achnelith 
Small, glassy volcanic bomb, sphere, dumbbell and droplet shapes resulting from very liquid magma.

Pahoehoe lava 
Vesicular, basaltic lava with ropy surface texture.

Reticulite  
Lightest rock known. A basaltic pumice in which the walls of the besicles have collapsed, leaving a network of fine, interconnecting glass threads.

Palagonite
Submarine lava flow altered to yellowish-brown colour by the formation of the gel mineral palagonite.