Two identical pieces of basaltic shergotitte were found together in 2004 in the Roberts Massif of Antarctica. Not sure if this is related to RBT 04261 or just collected at the same time.
This collection of meteorites includes Shergottites, Nakhlites and Chassignites (or SNC meteorites) which originate from the surface of the planet Mars.
They carry unique signals of the surface of the planet that allows scientists to study the composition and age of Martian rocks. The collection includes a sample of the famous ALH84001 meteorite, evidence from which was used in 1996 to begin the debate of 'life on Mars?'.