This one claims to be selling 11g of NWA 2373, a Martian shergottite of which the TKW is 18g (3.7g type specimen). The seller has a rating of 1 star. http://www.ebay.com/itm/Martian-meteorite11g-NWA2373-/221177646116?pt=LH_DefaultDomain_0&hash=item337f370c24 Bogus. Best, Michael in so. Cal.