The metamorphosed volcanic rock of the upper member of the Haizhou group is rich in alkali-feldspar (60 to 70%) and high potash feldspar (35 to 60%).

• 苏北海州群云台组上段变火山岩富含碱性长石(60-70%25)和钾长石(35-60%25)；黑云母为富铁黑云母；部分火山岩含霓辉石、萤石等.