NWA 1836 was discovered in the Sahara Desert, Africa during 2002 and purchased in Rissani, Morocco in 2003. Two matching pieces of a single stone weighing 1102g were found however another 334g piece was also later found which this slice was taken from. This meteorite has been classified as a rare melted Monomict Cumulate Eucrite with a very fresh weathering level of 0 to 1. The Shock Rating for NWA 1836 is an extraordinarily variable 1-5.

This meteorite is very unusual and unique with its highly contorted mass of eucrite clasts with cataclastic mantles that are in turn covered by partially melted to recrystallized masses. Cataclastic metamorphosed materials have been subjected to high-pressure and low-temperature conditions, resulting mainly in a change in texture of the original rock. Because of the visible texture of this meteorite, it has been dubbed "Twisted Sister". The specimen below is part of the Meteorites Australia Collection (MA.05.0085).

NWA 1836 (Eucrite) - 7.1g Crusted Slice
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NWA 1836 (Eucrite) - 7.1g Crusted Slice
(Click image to enlarge in new window.)