Stony-Iron Meteorites

Stony-iron meteorites are the rarest of the three major meteorite classes, with roughly equal proportions of silicate minerals and nickel-iron metal. They include some of the most visually spectacular specimens known, especially pallasites, where translucent olivine crystals are suspended in a polished metal matrix. Unless specifically stated in the listing, specimens in this collection are Meteoritical Bulletin classified.

How we verify stony-iron meteorites are real

Every specimen is tied to a Meteoritical Bulletin entry, the official global registry of classified meteorites maintained by the Meteoritical Society. Classification is performed by accredited laboratories that confirm metal composition, olivine chemistry, and parent body affinity. The Bulletin record is the definitive proof of authenticity, beyond any visual or magnetic test. Read more: The Meteoritical Bulletin Explained.

Two main types

Pallasites are believed to form at the boundary between the molten metallic core and the silicate mantle of a differentiated asteroid. They contain large gem-quality olivine crystals embedded in nickel-iron metal. When cut and polished, pallasite slices can transmit light through the olivine, producing one of the most striking visual effects in all of meteoritics.

Mesosiderites are breccias of metal and basaltic silicates that likely formed when a metallic asteroid core collided with the basaltic crust of another differentiated body. They lack the translucent olivine of pallasites but show dramatic textural contrasts between metal and dark silicate clasts.

Frequently asked questions

How can I tell a pallasite is real? Authentic pallasites have a Meteoritical Bulletin classification, ship with documentation, and show characteristic olivine crystal habit and nickel-iron Widmanstatten structure when etched. Read more: How Can You Tell if a Meteorite Is Real?

Are pallasites and mesosiderites magnetic? Yes. Both contain substantial nickel-iron metal that is strongly magnetic, although individual olivine or silicate clasts within them are not. Read more: Are Meteorites Magnetic?

Why are pallasites so expensive? Pallasites are among the rarest meteorite types by mass and the most visually desirable. Combined supply across all known pallasites is small, and gem-quality specimens command premium prices. Read more: How Much Do Meteorites Cost?

Will pallasite slices tarnish or rust? Yes, the metal matrix can oxidize if exposed to humidity. Store pallasites in low humidity conditions, ideally with silica gel desiccant, and avoid bare-finger handling on polished faces.

Are these specimens authenticated? Unless otherwise noted, every stony-iron meteorite here has a Meteoritical Bulletin record and ships with a Treasure Coast Meteorite Co. certificate of authenticity.

See also: Iron Meteorites · Chondrites · HED Meteorites · Types of Meteorites · Are Meteorites Illegal to Own?