Since these structures have great beauty, it is a pity that in recent years other materials have replaced coral because it is difficult to work.
當熔融的岩漿噴出到地面時，在原始陸面上冷卻凝固，熔解的玄武岩漿大約在攝氏一千度下逐漸收縮固化，由於體積乾縮，容易形成六面體的柱狀裂線，就像乾裂的泥土一般，這就是柱狀節理。