It is a yellow crystalline solid. It is an oxidizing agent in an acidic condition. It is toxic though, because it contains chromium in its +6 oxidation state. It can be destroyed by reaction with reducing agents. It is very rarely found in the ground. It reacts with lead nitrate to make lead chromate, a yellow pigment.
Potassium chromate is found very rarely as a mineral. It dissolves easily in water. It is only found in very dry places.