I was just notified the US Patent Office awarded this patent on a lunar construction technology. It is a method to reduce the energy for sintering lunar soil into a concrete-like material. My hypothesis was that magnetic and microwave susceptibilities should be correlated, since magnetic loss tangent is one of the mechanisms of microwave absorption in minerals. Lunar soil is a mixture of both magnetic and non-magnetic minerals, so magnetic sorting should create isolates that absorb microwaves either more or less, and these isolates can be laid down in layers of varying absorptive to control the depths of microwave power absorption. This is needed to obtain uniform sintering to deeper depths without making the top so hot that it begins vacuum vaporization, AND without wasting excess power at deeper depths. The hypothesis turned out to be correct. Experiments with @cislune proved deep energy and cost savings.