- NWA 12691, NWA 12760
- 103.8 kilogram(s)
- Western Sahara ()
Of the 417 documented lunar meteorites (as of Sep 2020), the largest in overall mass discovered to date is NWA 12691, a lunar feldspathic breccia recovered from the Western Sahara/Algeria border region in January 2017, whose multiple pieces weighed in at a total 103.8 kg (228 lb 13.4 oz); the largest of these discrete pieces was 15.555 kg (34 lb 4.7 oz). The largest single fragment of a lunar meteorite found to date is NWA 12760, another feldspathic breccia recovered from the same area of Africa, weighing 58.090 kg (128 lb), which was found in April 2017. Both meteorites have been officially signed off by The Meteoritical Society.
The prefix "NWA" refers to north-west Africa, where thousands of meteorites have been recovered; the space rocks are easier to detect in barren landscapes such as deserts and ice sheets.
Both lunar meteorites were purchased by Darryl Pitt, curator of the Macovich Collection of Meteorites.
Minerals that were present in both meteorites include anorthite, olivine, pigeonite, augite and chromite, among others.
For NWA 12691, beyond the 15.555-kg fragment, other sizeable pieces weighed 15.435 kg, 13.650 kg, 12.480 kg, 8.960 kg and 3.460 kg; nine specimens were between 1 and 4 kg, 31 specimens were between 100 and 500 g, and there were numerous smaller fragments.