When a meteor smacks down it becomes a meteorite, and this one scattered ... in this block of mineral components including olivine, pyroxene, feldspar and glass gives it an age of roughly 4. ...

They are then divided into three broad classes—H, L and LL—based on the iron content of the meteorites and the distribution of iron and magnesium in the major minerals olivine and pyroxene.

a group of 150-220 Ma Martian meteorites, typically basaltic in composition, coarse grained and enriched in incompatible elements. NWA 4468 is a basaltic sample with large pyroxene oikocrysts, ...