These 'meteorwrongs' are from the depth of our earth, thrown out during a volcanic eruption as a volcanic or olivine bomb. This is as close as we can get to samples from the core of our Earth.

Many of these bombs are filled with nice green olivine crystals, most of them shattered by the enormous forces of the eruption. This bomb is un-cut and has a very nice lava/ scoria crust.

These come from Mount Shadwell, the highest of a group of scoria cones. The arrangement of the four overlapping scoria mounts suggests an original crater with a high southern rim opening towards the Northwest, and probably covered during later eruptions.

It is assumed that the explosion that produced these bombs happened within the last million of years.

The scoria comes from beneath the earths crust, approx. 250 km below, and is ejected as particles ranging in ash ( up to 4mm), lapilli (4 - 32 mm) and finally blocks and bombs ( ranging from 32 mm upwards). The bombs are often drop shaped due to their solidifying from a liquid or semi liquid form as the plummet through the air.

Mt. Shadwell is noted as a good source of olivine and augite ultramafic xenolith as well as clinopyroxene and orthoclase megacrysts contained in basalts and scoria. The host rock is basanite which is the most common lava from such types of volcanoes.