Antarctic shergottite EETA 79001 and polymict eucrite ALHA 78132 contain Hg which is anomalous in the 196Hg or 202Hg isotope. The anomalous fractions were extracted at 130 ¿C during stepwise heating of neutron irradiated samples. The 196/202Hg ratios differ by factors of 2--4 from the normal Hg ratio. This is an enormous effect. Approximately fifty other Hg fractions extracted at temperatures up to 1200 ¿C from these and several other Antarctic basaltic achondrites and from the non-Antarctic fall, Shergotty, gave 196/202Hg ratios within 20% of normal.