Shalka vs Johnstown

Shalka is a diogenite meteorite that fell in Bihar, India, in 1850. Diogenites belong to the HED clan of differentiated achondrites and consist largely of magnesium-rich orthopyroxene, representing igneous material formed within the crust of a differentiated parent body. HED meteorites are commonly linked to asteroid 4 Vesta, making Shalka relevant to studies of deep crustal processes on that body...

Johnstown is a diogenite meteorite that fell near Johnstown, Colorado, in July 1924 after a witnessed fireball and detonations. About 23 kilograms of material were recovered, making it a substantial documented diogenite fall. Its coarse-grained, orthopyroxene-rich composition places it within the howardite-eucrite-diogenite clan, meteorites generally interpreted as samples from deep within the cru...