For readers who want the full picture
Detailed explanation
This traditional main class combines metallic phases such as kamacite and taenite with silicates. Its two major classes are pallasites and mesosiderites.
Despite the shared name, they have very different textures and formation histories.
- Main classes
- pallasites · mesosiderites
Different kinds of mixture
Pallasites usually show olivine crystals in metal. Mesosiderites are complex breccias of silicate and metallic debris.
A practical class, not one shared origin
Stony-iron meteorites contain conspicuous amounts of both silicate rock and iron-nickel metal. The traditional name describes this mixture and must not be mistaken for one common formation process.
Pallasites usually contain olivine crystals in metal; mesosiderites are complex breccias of metal with basaltic and deeper rock fragments. Chemistry and isotopes show that the two families are not merely variants of one parent body.
Appearance, density and preservation
On polished surfaces, metal may appear brightly reflective while silicates form grains or fragments. Pallasitic olivine may be yellow-green to brown and partly translucent; mesosiderites often look more irregular and brecciated.
Metal raises density and corrosion risk. Moisture can oxidise iron and promote cracks at silicate boundaries. Attractive appearance or high density still does not prove authenticity; classification and documented provenance remain essential.
Short & simple
The essentials in 30 seconds
- Meteorites containing substantial silicate minerals and iron-nickel metal.
- This traditional main class combines metallic phases such as kamacite and taenite with silicates. Its two major classes are pallasites and mesosiderites.
- Despite the shared name, they have very different textures and formation histories.
Sources & editorial note
Sources & databases
Editorially paraphrased prefill, reviewed 12 August 2026. The linked sources support further specialist verification.