Volcanic bombs are ejected from Volcanoes, but at much lower velocities to those found during asteroid impact.

ABOVE: A typical Fusiform Volcanic Bomb that I collected in Spain.


ABOVE: A Breadcrust Volcanic Bomb, in the British Museum of Natural History.

At one point I considered whether the Breadcrust Volcanic Bomb had any relevance to Philippinite breadcrust formation, although personally I'm not that keen on the idea. Breadcrust bombs formed by expansion of pressurised gases, resulting in a cracking of the exterior surface. Another image can be found in the link below.  

A great volcanic bombs page can be found at Glendale Community College Earth Science Image Archive.


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