Stony iron meteorites were formerly called siderolites.
They can be  divided into two groups.

Pallasites are from the core/mantle boundary of differentiated planetoids that were broken apart by impact. They are characterized by the presence of large crystals of olivine embedded within an iron-nickel matrix. In most cases, they have chemical, elemental, and isotopic features that link them to specific chemical groups of iron meteorites, suggesting that they come from the same parent bodies as these irons.

Mesosiderites, a mixture of nickel-iron and various silicates, are thought to be the result of the impact of an iron meteorite on an asteroid whose surface was mostly of basaltic origin such as the howardites, or eucrites.