The shape was a dark sharp triangle that made no noise and seemed transparent from directly below.

Very large black triangle against a clear night sky with a new moon. Looked like a large bird soaring over refractory palnt with lights on it. As it got closer it was a large, black triangle.Against the sky it was black, darker than the sky and looked see through as though it were glass. It had stars in it but not quite the same as the sky. Made no noise headed straight north over a corn feild. Moved very slow. It looked over 200 feet wide. as it went noth it seemed to look more solid and not see through again. Saw no flashing lights or any other markings just looked dark at a distance and see through from below.  Back then I thought it was a Stealth Bomber but since then I have seen a Stealth bomber, they are not squared off like what I saw and are very noisey.
Date is approximate.  PD