An investigation into bloatable raw material comprising of shale, suitable for use in making lightweight aggregate has been mode to exist in large quantities in the region of Naka Pabni located in Kirthar province to the North of Karachi. Field studies have revealed that extensive deposits of shale occur in the region Test results indicate that the material can be bloated successfully at 1,100 degreesC and the resultant bloated material becomes considerably lighter than the conventional aggregate. The expanded aggregate is hard, highly cellular and has a tough water resistant skin and uniform structural strength.