Potassium deposit in Feicheng city belongs to potassium-pegmatite vein type.It was formed by residual molten mass intrusion along cracks in later period of magma intrusion in later protogean period.

• 肥城钾长石矿属钾长伟晶岩型脉状矿床,由元古宙末期壳源岩浆侵入活动晚期冷却时形成的硅酸盐残余熔融体沿构造裂隙侵入形成。