"Shale oil and a fuel gas have been produced by microwave heating oil shale in a standard microwave oven in conjunction with experimentation in development of an in situ microwave retorting process. Various grades of oil shale have been subjected to high microwave fields and the derived oil has been submitted to various testing procedures. Among these are specific gravity, pour point, % H20, % ash, % gas and losses, % coke, % of Fisher assay, and others including gas composition. These data are compared with parallel data obtained on Fisher assay oil. Important differences in oil flow properties and gas composition are discussed in view of microwave interactive theory."