Vaca Muerta, “Eucrite”

Vaca Muerta is a mesosiderite: a stony-iron meteorite characterized as a mixture of core, mantle, and crustal material, all mixed together by a massive impact ~4.5 billion years ago.

This is a 55 gram slice from one of the largest eucritic clasts found in Vaca Muerta.  It appears to be a monomict impact melt breccia.

For more information on these interesting clasts, see: Diverse eucritic pebbles in the Vaca Muerta mesosiderite, by Alan Rubin and Eric Jerde (1987).