(46/47)  Anorthosite becomes leucogabbro if it contains less than 90 % plagioclase and more than 10 % dark minerals. (Plagioclas must be the only feldspar.) Such Leucogabbros are not very rare as boulders at all, however one cannot be sure also with them where they come from. (This erratic derives from somewhere in Sweden, Aland or Northern Baltic Sea. It was found at the coast in Northern Germany.)