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Stony-Iron Meteorites

Stony-iron meteorites contain approximately even amounts of silicates and nickel-iron alloy, and are divided into two distinct groups: Pallasites and mesosiderites.

Pallasites are believed to form between the silicate mantle, or outer shell, and molten metal core of a differentiated asteroid. The primary silicate mineral in pallasites is olivine, distinguishable by its greenish hue. 

Mesosiderites are brecciated stony-iron meteorites that contain nearly equal amounts of metal and silicates. They are likely formed by collisions of metal-rich and silicate-rich asteroids, and their silicate portion is composed mainly of igneous rock fragments. Fewer than 150 mesosiderites have been identified to date.

Click on an image to enlarge and see additional information about the meteorite.

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